whenever I single or double click on any AVI video file an error message pops up
If you single click a file to select it (not open it) and your system errors out or crashes, it indicates a damaged shell extension. In your case, the .avi extension.
Download the zipped version if ShellExView here
near the bottom of the page. It has no installer.
Extract the files and run "shexview.exe". The list may need a second or two to populate.
Next to the extension names under the "disabled" category, they would normally all say "no".
Scroll down the list to "Video Thumbnail Extractor", right click and select "Disable Selected Items".
At the prompt, select "Yes", close the app and see if it now crashes. If it still does, repeat the procedure for "AVI Property Handlers" and disable it. Don't worry about changing anything permanently, just use the program to re-enable.
Of course, you'll want to be booted in to XP before you do this.
Let us know the results, we are not done yet.
Edited by HitSquad, 19 September 2008 - 07:07 AM.