Hello, You have a GeForce 560 GTX video processor.
My suggestion is to go to this link and click the green download button and download the driver package.
Edited: that link below is the 64 Bit driver, I do believe your system is 64 Bit based on what I see in your Speccy report.
Once you have the package on your computer, instead of choosing the default installation option, choose the manual option and have the installation clean your computer of previous driver installations before you have it install the new driver. This way, you do not have multiple installations of the video driver in your system's driver directory.
After it is finished, restart your computer and hopefully this will stop the problem from happening. If it continues, I'd double check your system for dust issues. Your graphics processor could be over heating.
Edited by MrBruce1959, 03 December 2013 - 07:11 PM.