2. Open Registry Editor (regedit.exe) and search for wgalogon folder and delete it. You should backup up the registry beforehand, in case somethiong goes wrong.
3. In your windows directory search for files wga* and delete them.
You are done!
Now reboot back normally and continue your work. Windows Genuine Advantage will not bother you anymore.
Note: I had previously posted a tip which requires a third-party executable. Now it is not required anymore. You can do it yourself by carefully following the guide above.
Warning: Use at your own risk. Backup everything before you do.