My pc is hang when i open avi or vob files

Hi,
While in Windows Explorer, if I happen to look in a folder that just
contains an AVI and vob files from my laptop (don't even open the
AVI file), DrWatson gives me a warning (can't remember the details) and then
Windows Explorer hangs and have to do a CTRL-ALT-DEL to terminate W.E. and
error report goes out to Microsoft. (no response of course) Happens every
time.This does not happen on my omputer so there has to be a
problem (conflict?) on this desktop.

Any suggestions as to what is causing this problem?

Thanks,
kadam