donimo, congrats on the rug rats! I experimented with CF many moons ago. Found it wasn't for me. Things might be better now though. I do know that when it works it's a worth it. Your problem sounds like it might be with a bad driver un/install. Try
Driver Sweeper in safe mode after uninstalling Catalyst. Then boot back to Windows normally and reinstall Catalyst. See if that does the trick.
Masteroderus. his spec is at the bottom: Corsair HX620