From a non computer expert this is what happened today. I have noticed using Aero Scenery that on the odd occasion an error message came up on the Win 7 task bar stating that the Nvidia GPU stopped and has restarted or something like that.
Today I removed the latest Nvidia GPU driver and did a clean install with a 3 year old Nvidia driver.
The results using Aero Scenery have been incredible.
What took hours is now taking only minutes to compile.
Strange things computers!