Ok well thanks for ya help tbh I quite like a fresh install :P
By the way this has happend in the past, corrupted startup files, do you think there's something wrong with my hd, and should I get a new one? I might just buy a new HDD and 64bit windows 7 so I get all my allocated RAM.
If you get continuos corruption it can be that you do not have a good surge protector. A UPS from APC has a great surge protector and a battery back up in case of power loss. If your computer goes off without a proper shut down, you may very likely get corruption
If you are changing one word in a 20 page report and then you try to save but it shuts down, you may lose the whole report. Back up and have good surge protector like mentioned above