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I just upgraded from a radeon 9200 se to a nvidia 6200 graphics card.
When I tried to run hl2 I get a blue screen from nv4-disp.dll.
I ran the ati cat uninstaller, and reinstalled the nvidia drivers from the card cd.
same results, I uninstalled and reinstalled the latest drivers from the nv site.
I also reinstalled HL2 from cd and allows stream to update it.
Same problems. Farcry and Doom don't give me any trouble.