This is the only way i could sort out the problem that you're having:

Goto Start ==>Run type "regedit", enter. Now you're in the register. Delete this registerkey: HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{87D62D9 4-71B3-4b9a-9489-5FE6850DC73E}\InProcServer32. DON'T CHANGE ANYTHING ELSE!!! Close register and restart pc. The problem with the avi's should be disappeard. Deleting of this registerkey has no further consequences