Thank you for the fast help. I searched the internet and found out how to open the 32Bit registry (regedit -m).
So in the 32 Bit Registry the right keys are there - but in 64 Bit they don't.
Am I the only with this problem? For me it looks like a general 64Bit Vista Problem.
I also tryed DVD Decr........ Same Problem.
Or is it on my Vista installation, but I installed ImgBurn nearly the beginning of installation (right after Firewall and Antivirus).