Haha! Yeah, WMM sucks. Especially the XP version, it's a bit better on Vista but it still crashes all the time(dunno 'bout Windows 7 though, probably still as unstable as ever). I've used WMM ever since I started making music vids. It's okay for the small stuff, that is, when it actually does work.
I just recently started using the Adobe software for my MV's and it's a huge upgrade, although they're quite the price to pay so I won't be recommending those to you. What I can
recommend though is this program called Pinnacle Studios
, it's a lot like WMM but without all the epic failure.