Computer issues, netgear wifi adapter?

Lately I have been having extremely irritating issues with my computer. It all started a few days ago when I was playing with one of my nephews on his favorite game "Minecraft". After playing for a while on a hosted server he lagged out and couldn t rejoin, I later found a had the same issue but when I restarted my computer everything went wrong. The bottom of the desktop was pure white not light grey, my wifi (which is connected by a netgear wifi adapter) would turn on then turn off and wouldn t list any problems in the troubleshoot. I ve reinstalled my netgear adapters disk which installed the program for it. But when I openedmit my screen zoomed in and became extremely discoloured. I am extremely confused and since I need my computer for I need urgent help. If you could spare your time to help me I would be very grateful.

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