quad core

We have a new computer with an Intel Processor Quad Core Q6600 and Materials Studio 4.2
When we use discover with only one processor everithing is OK, but when we try to run in paralell 2, 3 or 4 processors,the system says "running" but nothing happens.
Until now we had a computer with a processor dual core E6600 and everithing worked well. Therefore we are quite surprised about the problem.
Any idea?