Hi. My Mums Toshiba Satellite C660D was automatically updated to Windows 10 From Windows 7 and now runs terribly. CPU usage is 90% all the time , even at idle and it takes forever to do the simplest task. I added 2GB more of ram but has barely done anything. Shes an old lady and doesnt want to have to re-learn all over again with another laptop. Any advice on drivers for win 10 or how to put it back to win 7 would be great thanks.