How to Fix Windows 7 Activation Error 0xC004F061
This error occurs when you install Windows 7 from a clean drive with an upgrade license. You can install Windows XP and then install Windows 7 from within XP or you can do the following:
Activate
- Open a command prompt window as an Administrator
- Enter the following commands
slmgr -ipk <Product key>
slmgr -ato Let me know if this helped you! Leave a comment.

Tried this, a Windows Script Host window pops up saying “On a computer running Microsoft Windows non-core edition, run slui.exe. Tried the -ato command too, says the activation key is blocked.
Make sure you are opening the cmd prompt as an administrator.
Also some antivirus can block the attempt to change the key as protection
cmds exec ok
saw failure ms
then saw success msg (yes a standard MS contradiction !)
rebooted but still prompted for the act ket – so did not work for me
I tried this and the first step worked with the product key but when I tried the second step to activate it told me that the activation key would not work.