Wow, that worked for me!!! Thanks, man!!! What I did was install Rivatuner.exe by itself, after I took it out of the folder that contained another file called RivaTuner209Drv.rtu, that caused problems. So I made sure that little file was with the .exe install and I also copied it over to RT's directory. Now it works just fine with Vista x64 with SP1 installed.. splendid! One question--RT's monitoring no longer shows Video Memory used (Local and Non-Local) in Vista x64. On my other PC with WinXP, it shows Video Memory in monitoring. Is it because of a missing plug-in for Vista?