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A DLL file, also known as Dynamic Link Library, is a file containing different functions which are mostly used across multiple applications. In order to unregister a dll file to troubleshoot a problem in Windows XP or Vista, follow these instructions:

1. OPEN COMMAND PROMPT:

• From START menu select RUN option.

• Type “cmd” (without the quotation marks) . This calls up the Windows Command Prompt

Click OK.

2. NAVIGATE TO THE EXACT LOCATION OF DLL.

Type “regsvr32 /u filename.dll” where “filename” is the name of the DLL that you are trying to unregister

• Press ENTER.

• After you press ENTER,  the confirmation window stating “DllUnregisterServer in (file name) succeeded” will be displayed