Hello all, i'm in need of big help pls!!! I just purchased an external 320Gb drive....which is perfectly okay, but somehow(very stupid of me!!!) I have accidentally backed up my c drive to my c drive i.e I had only used 74Gb of my 160Gb internal drive now its telling me i've used about 158Gb. I need to reverse this but have no idea how, and system restore wouldnt work, pls help!!!!