How to remove the desktop watermark from Windows 7 Build 7100 (RC)

Hi everyone how do i remove this? Hmmm.PNG I´ll be very happy if someone could help me
 
Not genuine means you have an invalid copy of Windows 7 installed.

If you have got a legit copy you can phone Microsoft and hopefully they will sort it out, if not you need to purchase a genuine copy.
 
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