nevermind, i got it fixed through a codec pack.. 
as the topic says, movie maker will not import any .avi files into the program. An error pops up and says the file is corrupt or something like that.
This all happened after I installed DivX, and I am wondering if it is related to that.
NOTE: I’m recording something using a program that puts it into a .avi format. DivX is doing nothing with it, but since the problem started after the installation, well..