Restart->Windows not genuine| Win+PauseBreak->activated

[skyli]

Hi!
After i restart my pc there is a watermark: Windows 7 Build 7600 This copy of windows is not genuine. But it's going away if i check (Win+PauseBreak) for the next restart.
Why is it happening and how can i solve it?

 

[seekermeister]

Try going to System Properties and scrolling down to the activation data and selecting "Change Product Key" link and reentering your activation key again.

EDIT: If for some reason that doesn't work, then try one of the methods described here:

http://www.winsupersite.com/win7/clean_install_upgrade_media.asp