Hi, hope someone can help me please?

AVI clips used to play perfectly through windows media player but tonight I installed the ad version of DivX and for some reason playback through wmp is now 'pixelly'. When I uninstalled DivX it left me with no picture on wmp so I've reinstalled it. I also tried reinstalling windows media player but that didn't help.

I did have some DivX files already installed on my pc but not sure which ones

Thanks to anyone who can help me

Tracey