I am not an expert on windows too. But you might try something just in case.
You might need the CD of Windows with this.
From Command prompt window run sfc /scanonce (More about this here: http://www.microsoft.com/resources/d....mspx?mfr=true)
This will check your Windows system files for corruption and replace them either from your hard drive or from your CD.
I think that this tool can run if you are loged in as admininstrator only.
Hope this will solve your problem.
Ioannis
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