You have/had a Trusted Store Tamper - possibly caused by over-zealous disk cleaning.
Please first try recreating Licensing Store.
Recreate the Licensing Store
Go to Start > All Programs > Accessories
Right-Click on Command Prompt and select Run as Administrator - accept the UAC prompt
Run the following commands in the Command Prompt window, using the Enter key at the end of each
net stop sppsvc
(wait until the service has stopped before entering the following lines)
After a couple of seconds Windows Activation dialog will appear.
You may be asked to re-activate and/or re-enter your product key or Activation may occur automatically.
If you are asked for your Key, use the one on the COA sticker on the machine's case
Reboot and Post back with a new MGADiag report
REN tokens.dat tokens.bar
net start sppsvc