Hello Andrew,

Thanks for your reply. So far I have focussed on Realband but I just tried to start BIAB 2010.5 and then I got the Access Violation error immedeately after loading an existing song that comes with BIAB and press Play! So in BIAB the error occurs anyway, not only when Midi-In driver is selected.
I also tried MME but the error still occurs. By the way, this is a desktop PC (HP Pavilion), not a notebook.

I also uninstalled Windows Media Center in Windows 7 because I heard somewhere it could influence audio on a system. But unfortunately it didnt solve anything.

greetings,

Valentino