Earlier today I was installing 3rd party themes for Windows 10. Before doing this I did create a system restore point. (No idea how to use it) After I installed this one theme (http://bit.ly/2b8nWuY) my computers screen started flashing grey and white. I'm not sure what to do now. I can go into the bios. And I do have a Windows disc. When trying to power on regularly the screen still flashes white and black. I'm not sure what to do can someone help.