So nfoav8or
Good news

First, Parallels works. It doesn't always at the first try. But it works.
Replaced seatbelt, VLC doesn't work. Moved it back, doesn't work. I always rebooted the system. Is there a new version of seatbelt?

USB2 problem, it seems I found the solution:
http://forum.insanelymac.com/index.p...440&start=440#

I'll give it a try