Hi. My name is***** you for your question and the opportunity to assist.
This can be caused by a Windows update. To to Control Panel and open Windows Update.
Click the Installed Updates link and on the page do a search for KB971033
and uninstall it.
Then change Windows Update settings and turn it off (for now)
Then click Start and type: cmd in the search area.
Right-click on the cmd search result at the top and select Run as Administrator.
At the blinking prompt in the black window type: slmgr -rearm and press Enter.
Restart your machine.
When it comes back up click Start, right-click Computer and select Properties.
Look toward the bottom of the page at the activation status. If may take a few minutes for it to change.