Sounds like a bad video driver install, try this:
To uninstall/install a Nvidia or AMD driver:
Download the new driver.
Download Ccleaner and install it.
Shut off your anti-virus!!!
Uninstall the driver and say no to restart.
Find and delete the AMD/Nvidia folder, then empty the recyclebin.
Run the registry section of Ccleaner, when it is done reboot the computer.
Cancel the two popups
Shut off the anti-virus!!!
Install the new driver and reboot as required. This should give you a clean install of the video driver. I have done it this way for years and it works well for both AMD and Nvidia.
If the above don't work for you, try going back to a point in time using the Restore Option to a date it was running well.
i seen you updated your vid card drivers..did you update them thru EVGA or Nvidia?
it makes a difference!
i would try the newest Nvidia drivers,and follow Nasty's install guide..its my rule of thumb.
but it most def sounds like a heat problem.
how did you reapply artic silver?
i must agree the stuff works great!