By downloaded you mean installed right? I'll just assume that's what you meant. Go get the 4.8 Catalyst drivers at ATI.com, if you don't have them already.

What are the rest of your system specs?

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Save and save often... unless your health is really low.

AMD Athlon XP 2500+ 333
ATI Radeon 9600XT
1GB PC-3200 Crucial RAM
NFORCE2 Ultra 400 Motherboard