Windows XP AVI Fix was created to help alleviate the problem a lot of XP users have: selecting an .avi file in Explorer causes Explorer to lock that file while it attempts to extract video and audio summary information from it.
While doing this, the file is completely locked and cannot be renamed, moved, or deleted. On big .avi files, this lock can last for minutes.
Please note: Once this fix has been applied, the information normally present in the Summary tab in the File Properties dialog (right-click on .avi file, select Properties, and then the Summary tab) will not be available.
To get it back, simply run Windows XP AVI Fix again and select Restore. Hit Start and (possibly) restart your PC.