Goto
“Start Menu -> All Programs -> Accessories” . Right click on “Command
Prompt” and select “Run as Administrator“. If you are not the
administrator then you are prompted to enter the password, or else you can
proceed to step-2.
2. Now type the following command
and hit enter
slmgr -rearm
3. You will be prompted to restart the computer.
Once restarted the trial period will be once again reset to 30 days. You can
use the above.... Click here to read more