I bought the game recently and installed it like usual.

The all known "inser cd" error appeared so i immediately looked for fixes

I do run it as administrator everytime by right clicking it
I did change the cddrive to C:
I did delete all reg entries after uninstalling the gog version
I did basically everything i gathered from all the threads

It still wont work sadly
I have windows 7 64bit

Oh that universal update worked.

Thank you very much, now i feel a bit stupid but oh well.