I bought the laptop from my computer repair person approximately April 2015 with Windows 10 installed. I assume they availed themselves of the free upgrade at some point. To be honest I did not ask...

I was using my Asus F551M laptop 2.1 Ghz running Windows 10 one day and all of sudden it stalled. I restarted and then the problems started. Bootup took about 20 minutes and once back to desktop...