Why: Windows Could Not Be Activated 0x4004F00C

You may receive a Windows licensing pop-up message error when you login to a volume licensed Windows machine.

Windows could not be activated

If you continue to see this error message contact your system administrator or technical support department for assistance.

Error:

0x4004F00C

Description:

The software Licensing Service reported that the application is running with the valid grace period.

The important part to this message is the application is running with a valid grace period message. When you receive this message, you can manually try activating Window’s again Start -> Activate Windows since it was probably not done on your machine originally.