Mooga, you can install drivers in Compatibility mode in Windows 7. Right click the setup file and Compatibility tab and check "RUn this program in compatibility mode for:" and set it to Vista SP2. Should install just fine
On another note, I have a custom built box run Windows 7 Ultimate 64 Final along with Windows 7 32 Pro at my office and have yet to have problems with anything.
Edit:
Didn't notice someone told you to install it in Compatibility mode. Sorry for the post