usually you can simply plug in the new card n the AGP Slot. Personally I even didn't have to disabl th onboard chip in the BIOS. Windows just installed a standard Driver and booted correctly, then I had to run the Ati Setup.
It also seems like this fixed the energy Problem I had before with some USB Devices: Cameras went into standby Mode because of a lack of energy or something. But maybe the card wasn't the reason why the camera works correctly now.
Well, back to the topic.
Patsawesome - Lithunwrap 1.3 is Freeware,
http://www.blitznetwork.com/tools/LithUnwrap.zip But a little warning : It's a bit complicated.