Yeah, these files seem to be fakes.
However, have you tried playing them using VLC
VLC media player - Overview
This player can play most things, including AVI files but if your files still refuse to play and crashes your PC again then you are better off without them.
Delete them, usings a special delete utility like "Unlocker"
UNLOCKER 1.8.5 BY CEDRICK 'NITCH' COLLOMB then run an AV and anti-spyware app on your HD to get rid of any rubbish those files may have planted on your machine.
UK Bob