Not only would I suggest reinstall and an anti-virus scan with some such program as
AVG Free 7.1, but I would also suggest that you buy a new computer, because that one is older/slower than mine, and mine runs like crap on CZ.
(1.3 Ghz P4, ATI RADEON X800XL 256MB, 768MB RDRAM)
Then again, my system might just be the biggest POS in the world that runs at like 1/4 of it's potential, which I'm sure Windows XP has something to do with.