WARNING - DO NOT UPGRADE TO WINDOWS 10 IF YOU USE A GRAPHICS CARD!!!
Windows 10 automatic update system is crashing machines that use Nvidia based graphics cards worldwide. The GeForce experience which is Nvidia's own software and driver monitoring tool is butting heads big time with WIN 10's driver updates. Microsoft will resolve this issue eventually, but as with all new OS releases, it is always best to wait a few mnths before upgrading.
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Pete - Precision