You will need a VALID license key. I have experienced this error on OEM editions hard-locked to the motherboard, and sometimes this helps to re-authenticate the system. I have also seen this on units with ‘Refurbished’ Authentication Stickers.
1.Click on the Windows button. Inside the search box type in CMD
2.Right click on CMD => Choose Run as Administrator
3.Inside the Command Prompt windows copy and paste the following commands
net stop sppsvc (wait for the service to stop before trying to enter any more commands)
REN tokens.dat tokens.bak
net start sppsvc
4.Reactivate using the System applet in the Control Panel
(Click on the Windows button. Inside the search box type in System)
5.Once done please restart your computer.
If this fails and you continue to have issues with a known good license, a likely scenario is the hard drive is having issues – even if S.M.A.R.T. status reports no issues. Clone to a new drive.