the reason for it is that u need to clean up your hard drive every thing u look up or view on the net is stored for faster viewing  u need to clean it up. use c-cleaner or window washer to do this easy. if u do not wnt to do it this way u can go to accessory  go to system tools go to disk clean up run it but make sure hybernate does not have a check mark beside it or u will defeat it then go under advanced and run it to get rid of shadow copys and and all but recent restore point. this should take care of your problem

im not understanding the shadow clones thing but I have the cleaner running on the drive its taken forever and said it only had about 10 mb to clear, its only got 2 green bars so far out of 20