1. If the Windows Imaging Component is not installed, you will need to install this first. In this case, it is the x64 (64 bit) version that needs to be installed.

2. Unpack the driver 7z file, and install the driver through the installer as usual.

3. Reboot to a live Linux media or a seperate Windows install, and go to the drive/partition of your XP x64 install, under the Windows/System32/Drivers folder. You will need to replace the nv4_mini.sys with the one that is provided in the same folder as the 7z, or else the XP install will BSOD upon boot.

4. Reboot to the XP install, and it should work just fine!