Please be sure to search for solutions before posting in the forum for a fastest solution as this has been brought up multiple times. It has to do with running an unsupported GeForce card and either Windows or NVIDIA has likely done an automatic driver updated that you are unaware of.
See this thread for more details:
Most in that thread say the solution is to install the latest driver, go back to an older driver, or turn off an anti-aliasing setting. See the thread for details.
I hope this helps,