Thanks, but unfortunately 1 gig of ram is all I can install in the machine
Oh sorry I misread your specs. You have enough RAM.
When i down load the demo version it loads to 61% than says "Error creating effect propdisc". does this mean my computer wont run the simulator?
Yes, it means your card isn't DirectX 9 compliant. See the list of working cards here:
http://www.knifeedge.com/rfvc_compatibility.php