I had Windows Movie Maker and Windows DVD Maker crashing every time i tried to import a movie, even a true wmv one.
The eventlog entry about is:
Faulting application DVDMaker.exe, version 6.0.6000.16386, time stamp 0x4549b5b0, faulting module iac25_32.ax, version 22.214.171.124, time stamp 0x3dd40ee6, exception code 0xc0000005, fault offset 0x00003548, process id 0x249c, application start time 0x01c7a87b3c004190.
This was an incompatibility issue with ACE Mega Codec Pack. After removing it, both DVD Maker and Movie Maker are working great.