Cubase artist 8 crash

I have upgraded my Cubase Artist 6.5 to 8.0.5.
When I load one project ok. But, when I load my second the system crash.
The symptom is:

  • No sound
  • can´t do anything
  • Disk cache load meters go to top
  • Primerry time meter go wacko, e.i all numbers over each other…

Somebody help?

I have tried to do the thing Steinberg suggested, remane the Cubase folder, memory check I have 4 GB but it never uses more than 3 GB…

My Cubase 6.5 works perfect!