The only thing you need to do is fully uninstall any previous drivers you have installed for your current videocard, especially if it's an NVIDIA card. After you uninstall the current video drivers, turn off the PC, and put the new card in. Then turn the PC on and install the ATI Catalyst drivers that ya need.
-Lasereth
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"A Darwinian attacks his theory, seeking to find flaws. An ID believer defends his theory, seeking to conceal flaws." -Roger Ebert
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