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A message appears that the *. dll(For example, VCompLib.dll). In this case, the program, of course, does not start.

Error messages can be different (it depends mainly on what language the program is written in), for example: "Component "MSCOMM32.OCX" not correctly registered: file is missing or invalid" , or "The application failed to start because MSVBVM50.DLL was not found. Re-installing the app may fix this issue.", or "Runtime DLL/OCX File error". A window may appear Program Compatibility Assistant with a message This program requires a missing Windows component.

Ways to solve the problem

If you encounter errors related to *. dll, necessary:

1. Reinstall the program.

2. If reinstalling the program does not help, you need to check the presence of the required files on the system.

Files *. dll, as a rule, should be located in the folder \Windows\System32(less often - in the directory of a specific program). If files are present, you need to register them.

If the required files are not there, find them on the Internet, download them and copy them to a folder \Windows\System32 and to the program directory. Now you need to register them.

How to register *.dll files

Registering *. dll performed using a registration server regsvr32.exe(whose disk address is \Windows\System32).

Let's look at the registration methods:

1. Click the button Start;

– in the text field Find programs and files enter regsvr32 filename–>Enter .

2. Press the button Start;

– in the text field Find programs and files enter cmd;

– in the list that appears (under the heading Programs) right click cmd.exe;

– from the context menu select Run as administrator;

– enter the password if prompted;

- in the window that opens after the system prompt, enter regsvr32 filename , press Enter.

3. If you use a file manager Total Commander, then you can register *. dll using the command line Total Commander.

If registering *. dll was successful, a window will appear RegSvr32 with a corresponding message, for example: "Successful execution of DllRegisterServer in C:\WINDOWS\system32\msvbvm50.dll":

Notes

1. When registering *. dll they are recorded in Windows Registry . At the same time in the thread the corresponding parameter is created REG_DWORD with meaning 1 .

2. Using the command regsvr32:

regsvr32 ] DLL file

/u– cancels registration DLL;

/s– “quiet” mode – message windows are not displayed;

/i– causes DllInstall, passing an optional command_string as a parameter, when used with the /u switch causes DLLUnInstall;

Sometimes REGSVR32.DLL and other DLL system errors can be related to problems in the Windows registry. Several programs can use the REGSVR32.DLL file, but when those programs are uninstalled or modified, sometimes "orphaned" (invalid) DLL registry entries are left behind.

Basically, this means that while the actual file path may have been changed, its incorrect former location is still recorded in the Windows registry. When Windows tries to look up these incorrect file references (file locations on your PC), REGSVR32.DLL errors can occur. Additionally, a malware infection may have corrupted registry entries associated with Microsoft Visual Basic for Windows. Therefore, these corrupted DLL registry entries need to be fixed to fix the problem at the root.

Manually editing the Windows registry to remove invalid REGSVR32.DLL keys is not recommended unless you are PC service professional. Mistakes made when editing the registry can render your PC inoperable and cause irreparable damage to your operating system. In fact, even one comma placed in the wrong place can prevent your computer from booting!

Because of this risk, we highly recommend using a trusted registry cleaner such as WinThruster (Developed by Microsoft Gold Certified Partner) to scan and repair any REGSVR32.DLL-related registry problems. Using a registry cleaner, you can automate the process of finding corrupted registry entries, missing file references (such as the one causing the REGSVR32.DLL error), and broken links within the registry. Before each scan, a backup copy is automatically created, allowing you to undo any changes with one click and protecting you from possible damage computer. The best part is that eliminating registry errors can dramatically improve system speed and performance.

Warning: Unless you are an experienced PC user, we DO NOT recommend manually editing the Windows Registry. Incorrect use of Registry Editor can lead to serious problems and demand Windows reinstallation. We do not guarantee that problems resulting from misuse Registry Editor can be eliminated. You use Registry Editor at your own risk.

Before you manually repair the Windows registry, you must create a backup by exporting a portion of the registry associated with REGSVR32.DLL (eg. Microsoft Visual Basic for Windows):

1. Click on the button Begin.
2. Enter " command" V search bar... DON'T CLICK YET ENTER!
3. While holding down the keys CTRL-Shift on your keyboard, press ENTER.
4. A dialog box for access will be displayed.
5. Click Yes.
6. The black box opens with a blinking cursor.
7. Enter " regedit" and press ENTER.
8. In the Registry Editor, select the REGSVR32.DLL-related key (eg. Microsoft Visual Basic for Windows) you want to back up.
9. On the menu File select Export.
10. On the list Save to Select the folder where you want to save the backup copy of the Microsoft Visual Basic for Windows key.
11. In the field File name Enter a name for the backup file, such as "Microsoft Visual Basic for Windows Backup."
12. Make sure the field Export range value selected Selected branch.
13. Click Save.
14. The file will be saved with extension .reg.
15. You now have a backup of your REGSVR32.DLL-related registry entry.

The following steps when manually editing the registry will not be described in this article, since high probability may damage your system. If you want to receive more information about manually editing the registry, please see the links below.

Before you register a dll file, you need to understand for yourself what exactly the dll means and what it is needed for. As a matter of fact, dll is an abbreviation for the English term “dynamic link library”, which is translated as “dynamic link library”. This ability operating system gives us the opportunity to use it many times different programs, applications. The DLL includes the ActiveX system and various drivers. With the release of new operating systems, the dll also changed. In the beginning, disk space saving functions were imposed on the dynamic link library, since disk drives were not as capacious as they are now. The DLL used a component that is considered a library module for various programs, which run on the computer. Further, for the efficiency of libraries, Microsoft introduced a system of modular operation of dlls, the essence of which was the interchangeability of modules and the ability to work with programs of different profiles. Based on this, knowing how to register dlls or update libraries, you can more accurately configure the operation of your applications.

Troubleshooting Application Errors

Often, when installing or launching any programs, you could see a window pop up with an error of this nature: “The application could not start because MSVBVM50.DLL was not found. Re-installing the application" or "Runtime DLL/OCX File.error" may fix this problem. To prevent this error from happening again, you need to register the dll in Windows. And for this you need to know how to register a dll library so that it is correct and safe for your computer.

There are several methods to solve this problem:

• If this error exists, try reinstalling the program.
• If reinstallation does not help, then you need to check the dll libraries. You can find this information at this path: /Windows/system32/. Again, if you don’t find the files you need, then you need to download the libraries from the Internet and copy them to this folder (you can download them from the following resources: Free dll; dll.ru). After downloading, you need to register such dll files.

To register a dll in Windows 7 or Windows XP (there is no difference), you need to use one of the following methods:

• The first method: through the “Start” menu and the “Search programs and files” tab, you need to enter the line registration server regsvr32.exe and the name of your file, then you need to press the “Enter” key
• The second method uses cmd command, right-click on it and in the list that drops down, you need to click “Run as administrator”. Next, in the Windows command window, you need to enter again regsvr32.exe with the name the desired file(separated by a space) and then press “Enter”. The system itself will register everything and give you the appropriate window where it will be written, for example, the following information: “Successful execution of DllRegisterServer in C:\WINDOWS\system32\minvbvm53.dll.” All your missing libraries have been added and registered.

Sometimes when you start a program, a message appears that the *. dll(for example, VCompLib.dll) or *. ocx(for example seon.ocx). In this case, the program, of course, does not start.

Error messages may vary (it depends mainly on what language the program is written in).

For example:

“Component ‘MSCOMM32.OCX’ not correctly registered: file is missing or invalid”,

"The application failed to start because MSVBVM50.DLL was not found. Re-installing the app may fix this issue."

"Runtime DLL/OCX File error".

At the same time, in Windows Vista an additional window will appear Program Compatibility Assistant with a message

"This program requires a missing Windows component."

Brief information

DLL	(from English Dynamic-Link Library Microsoft Windows DLL ActiveX and drivers. in the world UNIX shared objects dll exe
ActiveX	Microsoft COM.
COM	(abbreviated from English) Component Object Model Microsoft OLE And ActiveX).
OLE	(abbreviated from English) Object Linking and Embedding Microsoft based on COM (OLE 1, OLE 2, OLE automation, OLE Database etc.).
ActiveX control	control element ActiveX; introduced in 1996 Microsoft OLE controls, OCXs, OLE custom controls Internet.
OCX	(abbreviated from English) OLE Custom eXtension) – movable controls, OLE custom control, OLE control. To put it simply, we can say that *. ocx- these are the controls ActiveXdll.
OLE custom control	OLE, OLE control.
OLE control	control elements OLE OLE ActiveX control. Synonyms: OCX, OLE custom control.

Ways to solve the problem

If you encounter errors related to *. dll And *. ocx, necessary:

1. Reinstall the program.

2. If reinstalling the program does not help, you need to check the presence of the required files on the system. Files *. dll And *. ocx, as a rule, should be located in the system folder \WINDOWS\system32(less often - in the directory of a specific program). If files are present, you need to register them.

If the required files are not there, find them on the Internet, download and copy them to the \WINDOWS\system32 folder and to the program directory. Now you need to register them.

How to register *.dll and *.ocx files

When registering *. dll And *. ocx they are recorded in Windows Registry(this can also be done manually). At the same time in the thread parameter is created REG_DWORD, for example C:\Program Files\InterVideo\Common\Bin\StorageTools.dll or C:\WINDOWS\System32\MSCOMCTL.OCX, with the value 1 .

Registering *. dll And *. ocx performed using a registration server regsvr32.exe(whose disk address is C:\WINDOWS\system32).

Let's look at the registration methods:

1. Click Start – Run… – Run program – regsvr32 file_name – OK.

2. Click Start – Run… – Run program – cmd – OK. The command interpreter will start cmd.exe, after the system prompt C:\Documents and Settings\Username> enter regsvr32 filename eg regsvr32 seon.ocx.

3. If you use a file manager Total Commander, then you can register *. dll And *. ocx using the command line Total Commander.

Note

Using the command regsvr32:

regsvr32 ] DLL file

/u– cancels registration DLL;

/s– “quiet” mode – message windows are not displayed;

/i– causes DllInstall, passing an optional command_string as a parameter, when used with the /u switch causes DLLUnInstall;

/n– does not cause DllRegisterServer; this can be used with the /i switch.

If registering *. dll And *. ocx was successful, a corresponding message will appear, for example in Windows Vista a window will appear RegSvr32 with a message "Successful execution of DllRegisterServer in C:\WINDOWS\system32\msvbvm50.dll".

Where to look for *.dll and *.ocx files

Find missing *. dll And *. ocx You can use search engines or the following resources:

On a personal note: pay attention on behalf of which user the DLL will be registered. Registering a DLL typically requires local administrator rights on the system.

Also, if errors occur, pay attention to the dependencies of some DLLs on others. For example, “module xxxxxxxx.dll is loaded, but the DllRegisterServer call failed, error code 0x80070005” may mean missing DLLs in the system (for example MSXML).

For Windows Vista, Windows 7 or Windows 2008 Server, there is a common problem with registering v7plus.dll (those who know will understand what it is 🙂).

There are two ways:

1. Start - All Programs - Accessories - Command line- right-click - Run as administrator and then register

regsvr32 C:\MyFolder\Folder2\v7plus.dll

DLL	(from English Dynamic-Link Library– dynamic link library) – operating system concept Microsoft Windows; dynamic library that allows repeated use by various software applications. K DLL sometimes also included controls ActiveX and drivers. in the world UNIX similar functions are performed by the so-called shared objects(“shared objects”). File format *. dll follows the same conventions as the *. exe, combining code, tables and resources.
ActiveX	name of a group of technologies developed Microsoft for programming component-based model-based object applications COM.
COM	(abbreviated from English) Component Object Model) – model of component objects Microsoft, a standard mechanism that includes interfaces through which some objects provide their services to others; is the basis of many object technologies, including OLE And ActiveX).
OLE	(abbreviated from English) Object Linking and Embedding) – common name(until 1996) object-oriented technologies group Microsoft based on COM (OLE 1, OLE 2, OLE automation, OLE Database etc.).
ActiveX control	control element ActiveX; introduced in 1996 Microsoft new name for independent programmable components previously called OLE controls, OCXs, OLE custom controls; unlike the latter, they allow you to work with Internet.
OCX	(abbreviated from English . OLE Custom eXtension) – movable controls , OLE custom control, OLE control. To put it simply, we can say that *. ocx- these are the controls ActiveX, performing approximately the same functions as *. dll.
OLE custom control	specialized control element OLE, OLE control.
OLE control	control elements OLE, programmable application components with an interface based on OLE, making it easy to include them in other applications; since 1996 they are called ActiveX control. Synonyms: OCX, OLE custom control.

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