AX for Retail R2 VPC - crashing?

Is anyone else experience this on the new R2 AX for Retail VPC?  I am running it on a Windows 7 computer.   Often for no reason I will be in the middle of a transaction and I get the "blue screen" and the VPC does a memory dump and closes.   I can restart it but of course if I'm in the middle of a demonstration this is embarrasing for the product.   Has anyone else seen this or have any ideas on why it crashes?  I currently have 8GB RAM on my PC and am only allocating 2GB to the VPC.