This is a discussion on Windows Build 7601 Not Genuine? within the PC forum, part of the Multiplatform Talk; Okay so my computer has been locking up all day, now it says this at the bottom right on the ...
Then I suppose the one thing you could try right now is what Ps360 suggested, which is to re-install Windows 7. Make sure to back up anything you wish to keep first, though.
Laptops don't tend to come with Windows installation discs, it comes pre-installed. They come with stupid recovery discs, which I'd advise against using.
If everything is above board, contact the shop you bought the laptop from. The hardware will still be under warranty and it's their obligation to install a legitimate copy of Win 7 on the computer. I suspect you've run a Windows update and one of the patch files has detected the authentication issue.
If you know it's an illegal copy, don't fret. Just grab a copy of Win 7, reinstall to correct the stability issue and use one of the WGA fixes to remove the notice. The "not genuine" notice is unlikely to have anything to do with the system lock-up. You're not prevented from using Windows in a restricted capacity, it's just a "we think this is a pirated copy" flag. By itself it's safe to ignore.