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Is your Windows 7 genuine ? (i.e. MSDN, Technet, Retail, OEM purchased rather than downloaded from a torrent...)
Have you activated with a 'crack' 'activator' etc?
If not, give MS a call.
You could also try entering your key in again. Maybe the info has gotten corrupted somehow...
This can happen with OEM branded disks when they're used on non OEM hardware, it can also happen when your disk came from a torrent, or eBay, and it could occur when you've shared or shown your key to a 'mate...'
What happens if you invoke this? C:\Windows\System32\slui.exe
Also run Windows Update to make sure everything is up to date. This sometimes clears up the problem message automatically.
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