A little late getting into this thread, but I'm curious...do you get the explorer.exe error when you're looking in a folder containing a downloaded AVI?
The reason I ask, explorer.exe will crash if you're browsing a folder containing a corrupted AVI file. That's not to say the file may actually be corrupted, but if you're downloading an AVI video from your favorite sharing or porn site
and the file is incomplete, i.e., still downloading, explorer.exe, which is "running" while viewing open folder with "My Computer", or browsing a folder with Nero's (or any program's) browse window, interprets an incomplete AVI as being corrupt and bingo...CRASH! And you have to close down the folder window.
Don't go chasing your tail on this, if the above scenario describes your situation. Simply DON'T have a folder window open where/when you're downloading an AVI. Wait 'til it's finished.
Do a Google search for "Explorer AVI Problem" and you'll see it's a very common problem.