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09 Jul 2012  

Windows 7 Professional x64 Service Pack 1

Since you don't have an installation cd, just download one of these legal install cds to do the repair: Official Windows 7 SP1 ISO from Digital River My Digital Life
You can also use the disc to reinstall Windows with a clean install which you may have to do depending on if doing what i and SIW2 said works or not.
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