I installed Win x64 with no issues. It actually installed very, very fast and didn't need me to install third party SATA drivers at all. I was able to get all the drivers for the x64 setup working but not the new ATI 5.4s for x64.
Everything was faster on the x64 setup so I would prefer it, but after the first reboot following the ATI 5.4 install I get a black screen. I have to completely reinstall the OS to get back to normal operation but lose it as soon as I install the ATI drivers.
Please help. Let me know if you have a working x64 setup with ATI!