Parallels - can't get any progs running? wtf

I needed to run a couple of progs which are win-only so i installed parallels.

However, i cant run and/or install hardly anything. Everything crashes. Most of the time clicking on setup brings up a window for half a second and then it just disappers. Sometimes programs give some error messages, like "error 0x12345678" or "error initializing setup".



Really frustrating, as i paid money for it and it doesnt do anything.

(MacBook Pro 2011, Windows 7 64)

 

Latest versions of both:

Mac OSX 10.6.8
Parallels 6.0.12092