Every time I turn on my PC, it says "disc read error, control, alt delete to start". The next window is "do you want to run windows 7". I enter and then it starts start up repair. Sometimes it loads files and and sometimes it stops in the middle. After a while it says repair has fixed the problem, restart. This happens 99 out of 100 times when I turn on the computer. Can anyone help. I have and Emachine.