Random Trackmania Crashes???

[Wii]

Well today I was just playing Trackmania and it just stopped working. The screen was there but you could only move the mouse and I have to get Task Manager and close it down (which pissed the frik out of me because I was working on a track... ) so now it crashes about every 5-10 minutes.
AMD Athlone x2 4800+
8800GT 512mb
Vista Home Prem.
320gb HD
3gbs of RAM.
I don't think it is a hardware failure.
I'm trying to think of things I would have done to make it be like this...
Oh, I installed and played Trackmania Sunrise Extreme (the demo) and uninstalled it because I didn't like it that much but what would that have done to make TMNationsForever crash?? :-?


EDIT: Fixed it using System restore without losing my data/rankings 8-)