Sometimes we need to register or unregister a DLL (A DLL file, aka Dynamic Link Library, are files that contain functions used across multiple applications.) file to troubleshoot a problem in Windows XP or Vista.

For example, Microsoft Office has hundreds of DLL files that can be used between the various Office programs to perform certain certain functions, such as spell checking, etc. Multiple programs can load the same DLL at the same time.

If you need to register a DLL due to some sort of corruption or installation failure, you can do it manually by following the method outlined below.

 Step 1:First click on Start, then Run and type the regsvr32 command followed by the path of the DLL file.

regsvr32 "C:\Windows\System32\Filename.dll"

Step 2: Now click OK and you should get a confirmation message that the DLL has been registered successfully.

That’s it! Now your DLL has been successfully added to the registry and can be used by Windows programs.

Note for vista users: If you are not able to register a DLL file and you end up getting an error message saying that the attempt to register the DLL file failed, you might want to disable UAC (User Account Control) in Windows Vista.

How To Unregister a DLL file

repeat the above steps except add the “/u” after the regsvr32 command

regsvr32 / u "C:\Windows\System32\Filename.dll"

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