If you already have onboard video, you need to disable it in the bios and set for the display adapter to be the slot the 2400 is in. If you're going from an intel or nvidia chipset to ati, you'll need to completely nuke the old drivers. The regular add/remove doesn't get rid of everything. Heres a good explanation how to do it with both kinds of chipsets.
http://www.hlfallout.net/forums/inde...howtopic=14506
Once that's done and you have the onboard disabled you should be able to reboot. Let Windows install the generic drivers. When that's done use the latest Cat drivers.
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