WMV crash

[fofu01]

My avidemux constantly crashes on wmv files. Not always, and when it does not it usually destroys the audio. And I have several over 4gig videos that are impossible to load at all. I can load a 10gig .mp4 file no problem but not wmv's. Is there any way to fix this wmv issue? These are the files I want to reencode most since wmv's suck, yet these are the ones that I almost never can.

[mean]

Providing a sample would help