windows xp media centre major problem

eyy guys i have a major problem on my pc.
when i click on a application eg a picture it opens up for around 3 secs then just closes, when i open computer managament it does same thing, same with windows task manager and when i try installing a program and stacks of other stuff. i dont no how this occured but i think occured after i uninstalled trend micro 08. it came up with quartine files will be deleted. i checked recycle bin 2 restore files but nothing waz there i think a important part of my pc got deleted.

plz help asap thanx in advance