Product Key Installed but not Genuine?

Since I change my boot drive from System Reserved to C:\, I lost my windows genuine. After checking the product key in HKEY_LOCAL_MACHINE\Software\MIcrosoft\Windows\CurrentVersion\ProductKey, there is no "ProductKey" in there. But, I check it with Microsoft Genuine Advantage Diagnostic Tool, it still shows my product key. Here is the result: Code: --------- Diagnostic Report (1.9.0027.0):...