I have Windows 7 Professional. I bought it in 2010 and it have never bothered me until when it started complaining. I have found that where I bought they did install Using their own product key but did give all Computers DVDs (XPSP3, Win 7 Pro et al). The Disks were lost in fire accident but I have its key (from bottom of laptop which is yet to be used anywhere) and The key they installed in my laptop (with no Discs).
Since My Windows is complaining I run sfc /scannow and found corrupt files and failed to fix them. What else can I do to make my PC work? I cannot even do Windows update. My diagnosis show that registry cleaners (I have used CCleaner and ASC and other one) might have tempered with files and corrupt them.
I need advice!