I know this an old excuse, but I would suspect that the graphics card is the problem. It is not officially supported.
Each new version of SW seems to be more & more demanding on graphics. Try updating to the latest graphics driver from nVidia.
But as Jeff stated, your card is not supported.
You have a resonable computer. Shame to cripple it with a gaming card.
* sigh * this is the answer I was expecting unfortunately. Thanks for your help guys.
I saw somebody posit the wild theory that Dassault is getting kickbacks from the graphics card manufacturers for every new version of Solidworks they release; I'm inclined to believe them at this point!