Zkus upravit registr :

Open regedit.exe with Start Menu Search and navigate to:

HKEY_LOCAL_MACHINE/Software/Microsoft/Windows/Curr entVersion/Setup/OOBE/

- Change MediaBootInstall from "1" to "0".

Open CMD (příkaz.řádek) as admin and type :

slmgr /rearm

Then, close the command line window and reboot. When Windows 7 reboots, run the Activate Windows utility, type in your product key and activate windows.