Windows Explorer Crashes When I Click on an AVI Movie File

This is probably caused by the wrong version of the Xvid codec on your system. Check in the Windows\System32 directory. If you have a file called "xvid.dll", this is the reason.

Go to the Control Panel, Add/Remove Programs, and uninstall the Xvid codec. Make sure Xvid.dll is gone.

Then go to www.xvid.org and download and install the latest version of the codec.

By the way, there is no way on earth that an essential Windows component like Windows Explorer should crash, under any circumstances. When calling an external procedure, such as Xvid.dll, Explorer should protect itself and recover if the foreign procedure fails. So this is yet another example of poor programming on the behalf of Microsoft.