Win7 system upgrade key input error handling scheme

In general, the brand computer installed system we bought is Win7 Home Basic Edition or Win7 Home Premium Edition, but this system often can not meet the needs of users, many users will pass The Windows Anytime Upgrade function that comes with the system, enter the upgrade key for system upgrade. However, individual users have experienced operational errors.
Error Analysis:
In the Windows Anytime Upgrade, the wrong Win7 upgrade key was entered. Even if the upgrade is cancelled, opening Windows Anytime Upgrade again will not prompt for the key, but will directly perform key verification. How to clear the wrong key?

The scheme is as follows:
1. Click the Start button, type regedit in the search box and press Enter to open the Registry Editor.

2, expand HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\WindowsAnytimeUpgrade, and delete the WindowsAnytimeUpgrade item.

After a simple two-step process, we can re-enter the correct upgrade key. From the method of appeal, we can also see that after the system verifies the key, the key is automatically saved in a key value in the registry, and we can delete it.