Hello everybody, sorry about all the fuss and sorry for my late reply.
It took me sometime to make a clean install of Vista Ultimate and I also installed AnyDVD again. After the clean install it works fine.
The key procedure worked without any problems but I have to make some reboots to see if it's still working after that.
I believe I messed up my Vista installation using some registry tools, because I have some bigger problems with WinDVD 8. Therefore I tried to solve the problem with some registry checking utilities like PcTools Registry Mechanic and also a very old program called RegCleanr. Well, guess I shouldn't have done so.
Sorry about my post in the wrong direction. Actually the truth is, Any DVD worked right since November/December since Vista was issued. Well some smaller issues like no auto start - which seems to be over now - but it worked. Therefore, great job SlySoft.
Sorry again for misleading you all, but I was misled myself :-(
Thank you for your help and taking care!
Windows is Windows, even it's called Vista - clean install always helps.