Quote -  I would check that the multi-threading is checked on the PC.  If it is, then to check if the system sees both processors.  Press Control-alt-delete or right click on the task bar, bring up the task manager.  Select Performance and it should have  a CPU Usage History section.  If it has 2 graphs there then the OS see's both processors.  if you do things you should see most activity in one, but should see some in both.

I saw both that processors are active.
I'm upgrading to Windows Seven...
Wait and see ;)

 
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Holyforest,
Hundreds of shaders for Carrara