The exact same thing has happened to me and also a few people I know. And every time, it was un-needed programs slowing down the PC and it freezes because it's not supposed to run so slowly.
you have too much on the hard drive. delete all things you don't need. make sure you're actually removing programs and not simpy deleting the desktop short cuts.
MY brother auditioned for the Xfactor. He had to go to Aston Vermin's ground. He was so nervous he lost his voice that morning and couldn't audition propperly =[