Originally posted by Snipe:

unlike what martin said, it has nothing to do with your drivers.

I don't think this is very good advice at all.

If he hasn't updated his drivers, he should.

Yesterday after installing No Man's sky the game would freeze HARD the moment my character moved. I had to do 3 hard computer reboots to get out of it. I went to Windows update, and it said I was using the latest drivers. However when I actually went to nvidia's site I found out I wasn't so I manually installed the newest driver and that fixed my problem.

I'm not saying drivers are for sure his problem, but if his mower won't start the first thing is to check the tank for gas.

Updating his drivers will at least eliminate one possible cause.