You have fialed to mention the make and model of your pc that is failing. It is important that we know what kiind of equipment you have, as each one is different. Each manufacturer has a better way to fix your machine, we need to know the best method. What kind of machine? How long did it run? Have you recently expereinced a flood?
"If you can't soar with the eagles, then don't fly with the flock!" - Oliver Sykes; Bring Me The Horizon