A lose codec pack doesn't work because the filters were not turned on in Windows Movie Maker itself. Al though why would you want the entire pack for K-lite; for WMM you only need a few.
I don't know if it will work though, I never use WMM.
CCCP - Combined Community Codec Pack
For the codecs.
Windows movie maker is very limited when it comes to loading in video's, it doesn't read a lot of files that other programs do. If this does not work then use a video converter.
If your subs disappear in the normal player after installing it;
If you play the video make sure subs are turned on under I think the tab Play -> subtitles
If not;
Read
http://aarinfantasy.com/forum/f49/t1...ml#post3739660