WMM Codec for discs and avi

Hi!! Sorry If this has already been posted, discussed and answered, but I make alot of videos with WMM, but Ive decided to try a new kind of video for it.
The video is on a disc, and its MPEG (I think?). Ive tried to put it on WMM but it comes up with 'E:\JACKET_P\J00___6M.MP2 could not be imported.'
I’m also trying to put an AVI file on it. It comes up!...But with no picture.

Ive tried codecs 'ffdshow' and 'k-lite' but they don’t seem to work (Even though k-lite seems to work for my two friends. Maybe its because I have Vista?)
Are there any codecs that could solve my problem? Are they ffdshow and/or k-lite? If so, what am I doing wrong when I’m installing them? And am I doing it right when I try to put the video discs onto WMM?

Thank you for your time, it’s greatly appreciated!