I ran the diagnostics software which came with my PC and that indicates that it's an error on the hard drive That's really not too specific, is the actual message it gave you any clearer? I'm thinking hard drive errors can be fixed, Windows even has a way to do that itself. If you can get the computer to run long enough to hit Start, then right-click My Computer and click Open, right-click the hard drive in question and click Properties, then click the first check box, for error-checking, then put a check next to *both* check-disk options for repair and see if Windows can fix whatever's wrong?
Or you could try this: on the next blue screen(s) you get write down the error messages exactly as you see them, including all the long funny looking codes and stuff. Then Google the error(s), or at least post them here and I'll Google them. Blue screens seem strange and stupid but will usually offer specific info as to what could be wrong.
Also, blue screens are often caused not just by software and/or hardware failure but also seemingly benign stuff - like dust. If you get error(s) indicating something hardware-wise might be at fault you can try this, though I must warn you it might not help: 1) disconnect the computer from all power sources, 2) press the power button 6-7 times to clear out all electromagnetic charges, 3) brace one hand on an all-metal part of the tower and with the other pry the cover off, and 4) blow out the inside of the case with canned air until you don't see a single particle of dust left on anything, then put the cover back on, reconnect to power and re-start it, the computer problem *might* be solved.
If you've just done all that recently you can disregard the above, but until there's some kind of error message that I can better parse, I have no clue what to do besides error-check the hard drive, clean inside the tower or re-install Windows.
ETA: Just read the reply you made to someone above and even if that means you've already re-installed Windows (?) I'll assume you didn't get a hard drive error message for nothing, nor those blue screens of death, so to be honest, re-installing Windows might not fix that problem. Bad hard drive sectors are bad no matter what you reinstall and have to be repaired in some fashion (or you need to replace it if it's too far gone), so before you run into problems again, if I were you I'd still do the hard drive error-checking thing I suggested above. You could also try this method for checking it: http://ask-leo.com/how_do_i_fix_a_bad_sector_on_my_hard_drive.html
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Or you could try this: on the next blue screen(s) you get write down the error messages exactly as you see them, including all the long funny looking codes and stuff. Then Google the error(s), or at least post them here and I'll Google them. Blue screens seem strange and stupid but will usually offer specific info as to what could be wrong.
Also, blue screens are often caused not just by software and/or hardware failure but also seemingly benign stuff - like dust. If you get error(s) indicating something hardware-wise might be at fault you can try this, though I must warn you it might not help: 1) disconnect the computer from all power sources, 2) press the power button 6-7 times to clear out all electromagnetic charges, 3) brace one hand on an all-metal part of the tower and with the other pry the cover off, and 4) blow out the inside of the case with canned air until you don't see a single particle of dust left on anything, then put the cover back on, reconnect to power and re-start it, the computer problem *might* be solved.
If you've just done all that recently you can disregard the above, but until there's some kind of error message that I can better parse, I have no clue what to do besides error-check the hard drive, clean inside the tower or re-install Windows.
ETA: Just read the reply you made to someone above and even if that means you've already re-installed Windows (?) I'll assume you didn't get a hard drive error message for nothing, nor those blue screens of death, so to be honest, re-installing Windows might not fix that problem. Bad hard drive sectors are bad no matter what you reinstall and have to be repaired in some fashion (or you need to replace it if it's too far gone), so before you run into problems again, if I were you I'd still do the hard drive error-checking thing I suggested above. You could also try this method for checking it: http://ask-leo.com/how_do_i_fix_a_bad_sector_on_my_hard_drive.html