Solved it! (after 1 sleepless night)
I moved my Firewire card to a slot as far away as possible from my graphic card.
Result:
No Bluscreens
Less VC crash Cubase (3 times during 6 hours of intese testings)
Some clicks and plops using USB
Not 100% stable but more as I aspected after reading forums about Virus TI.
I im really in love with this peace of gear despite the problems.
The sound is
awsome (first Virus I own) The VC Interface is so cool and fast to work with.
I hope Access have high priority in even more stable drivers and VC.