I got X51L and my hdd stopped working , so I bought new one SATA: PM Toshiba MK1665GSX.Sometimes when i turn on my laptop, it doesnt detect my hard disk.. after few restarts it recognize the hard disk but when loading Windows it stoppes and says it needs repair.
First I tried with Windows 7, after the instalation it works but when I restart/shut down, it cant load again. The repair starts but can not find any errors and shuts it down.I thought that it has something to do with my OS, so I format and instaled XP.. Same happened.. It worked after the instalarion but when I shut it down and turn it off - in the begining of Windows loading it says "Windows could not start because the following file is missing or corrupt: \Windows\System32\Config\System.
Please help me , how to fix it ?

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