Same here but some of the programs I like using still don't play well with SP2, even when they're supposedly written for it. I've set them to 98 compatible mode but no dice, they're unstable. Funny thing is they worked fairly well with SP1 so now I'll have to wait for things to get smoothed out.
You shouldn't have access to a keyboard if you can't keep your computer functioning.
Just kidding.
People - update your virii software. Run anti-spyware programs. Clear your cache. Defrag. Delete anything even remotely suspicious.
Be paranoid.