Problem: I bought my copy of Windows 7 Ultimate from eBay. After installing updates I received this error: “Windows 7 Build 7601 This copy of windows not genuine” How do I fix this?
1. Download and run the Genuine Diagnostics tool (MGADiag.exe)
2. Open MGADiag.exe and click “Continue”, after a few moments click “Copy”
3. Contact Microsoft Support Center (http://support.microsoft.com/select/Default.aspx?target=assistance) for help with your Windows product. Paste the report on your message.
Here are two possibilities: you have a genuine copy of Windows or you are a victim of a ripoff.
If you have a genuine copy you may have some problems with your Windows configuration. There can be a lack of permissions in the registry key HKU\S-1-5-20 or you have some missing registry keys. In both cases follow the instruction from the Support Center.
There is a big possibility for you to be a victim of a ripoff. In this case you need a new copy of Windows and ask for a refund from eBay. It’s recommended to buy Windows from Microsoft Store: http://store.microsoft.com/microsoft/Windows-Windows-7/category/102
In this video bellow you can find some tips about how to distinguish an original copy of a counterfeit product. It’s also an example of how good some ripoffs are made.