Crash while accessing mesh

I am new to Caelinux but not totally new to Linux generally.
I have down loaded Caelinux and installed on to a HDD running on a 64 bit Intel machine. No problems with the installation.
I have started Salome_Meca and imported an IGES file which came with CAELinux.
After following some steps similar to the piston tutorial, I accessed the mesh routine. There was a small delay the Caelinux crashed out of that user and restarted at the select user screen.
I have tried several time with the same results.

After loading Caelinux, I updated the PCLinux through configuration package. Could this have done something to to cause the crash and should I revert back to the install without the updates.
Your help or some ones assistance would be much appreciated.

Thanks Claus for your reply
The computer is new and 64 bit with a Nvida
8660 card ??.
Do I have to load special drivers for the card as I would like to do that first.

yes you should load the nvidia drivers for this card. Otherwise glx is not available and salome crashes

Johnny