When I try to run Rivatuner on Windows Vista x64 it says that the operating system is not supported. If I run it in compatibility mode, it looks for the 32bit DLL and can't load it. Is there a way to disable the check where it says that it is incompatible with my OS?
Try to use DisableOSCheck in the PowerUser tab. But no warranties, Vista is not supported and will not be officially supported till OS launch.