Hello Alan Wong5,
this error code usually caused by the User Account Control (UAC) prohibits activation processes from running in a non-elevated command prompt window. To resolve it, you can try the following steps:
- Open the Start menu and search for Command Prompt.
- Right-click Command Prompt and select Run as administrator.
- In the command prompt, run the command:
slmgr.vbs
Hope it helps.
Kind regards,
Lei