I get low memory/resources warnings when I have 12GB of RAM

I get low memory / resource warnings then SolidWorks crashes soon after when I have plenty of RAM unused.  My system has 12GB of RAM, when I get this warnings Task Manager shows 4-5GB used.  I am using WinXP 64bit and SolidWorks 2010 64bit.

Any ideas?

SolidworksAdministration