Welcome to the boards, MichiK!
May the Gael Serran soon resound with the tales of your accomplishments!
Now, for the issue at hand... you've got me for the moment. Have you tried downloading the codecs? GhostWave was the first person I recall running into that issue, and he got around it by using QEMU, which you said you've tried.
Hmmm... what's your mouse set to, in Control Panel? Perhaps there's something funky in there...some mouse driver issue or something.
Also, I saw Kakero had a resolution using something called act20. His notes are
here. Have you tried (can you try) that?
I'm on the road for the next several days, but I'll pipe back in when I can.