I had to reinstall the system, now securom has no problem with my other dvd drive.
After reinstalling windows I installed Divinity 2 and it worked finally. After that Panda Antivirus was installed and the same runtime error appeared. After uninstalling panda it worked again.
Looks like I have to find a new antivirus program if i want to play the game.
Thanks for your time and help btw.
