If you can't seem to upgrade your system using your Windows Anytime Upgrade kit or product key, check if your Windows 7 already has Service Pack 1 installed. If there's none, that can be the cause of the problem.
Install Service Pack 1 for your Windows 7 then the upgrade process should work just fine. You can get Windows 7 Service Pack 1 from this LINK.
If by any chance, still it doesn't work, then try this:
Run Regedit and search for the original product key. OR in HKEY_USERS\S-1-5-21-##########-########-#....etc, locate Software\Microsoft\Windows\CurrentVersion\WindowsAnytimeUpgrade
Delete the:
ProductKey REG_SZ
ProductKeyPurchasedOnline
Close Registry editor
Rerun the Windows Anytime Upgrade from Computer Properties screen, and the system will ask for a new key. Obtain the correct key and you should be good to go.
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