well i think for most programs this would work perfectly but with rivatuner it's kinda different. To be able to apply my OC at startup I have to check a box within the program which automatically makes it a startup application. If I run it with task scheduler it doesn't apply my OC so it doesn't work.
I turned UAC off, it was annoying so i avoided this problem, even though I would be glad if there was a useful solution...
thanks for your help nonetheless!