How to unregister a dll file in Windows XP or Vista?

Unregister DLL in Windows XP, Vista and Windows 7

Sometimes we need to unregister a dll file to troubleshoot a problem in Windows XP, Vista and Windows 7.

Here�s how to do it:

1. From Start �> Run, type �cmd� then click on Open.

2. Type �regsvr32 /u filename.dll� where �filename� is the name of the file that you like to unregister.

3. Press ENTER.
After you press ENTER, � the confirmation window stating �DllUnregisterServer in (file name) succeeded� will be displayed.

Note: Please keep in mind that this involves system modification and can be highly risky. It�s always recommended to keep a system backup handy, in case things go wrong.