I will start this by saying that I am using an Unsupported OS.

I am running SolidWorks 2009 SP4.1 under Windows 7RC1 64Bit.  Every now and then, and I can't put my finger on the cause, Solidworks will slow to a crawl.  Everything will get painfully slow.  When I check task manager, SLDWORKS.EXE is consuming 99% of the CPU.  When I click on the "Performance" tab, all four cores are pegged.  That is something seeing as Solidworks (as far as I know) doesn't even use the other three cores.

I'm running a Dell Precision 390 with decent specs.  When this is running correctly, I have plenty power.  This happens in a flash, and seems to go away for a while with nothing more than restarting SolidWorks.  I don't need to restat the computer though sometimes I do just to feel safer.

Anybody seen anything like this?