If you have installed the beta of the Windows 7 Service Pack 1 you probably might want to uninstall it again, because frankly, it does not offer anything spectacular. Even worse, it displays an Evaluation copy text in the lower right corner of the operating system, making it look like a trial version of Windows.
It is possible to get rid of the evaluation copy message with the help of the Windows 7 Watermark Remover, but this requires system file patching, with a tool hosted on a file host. The expiration date of the beta may be another reason why users may want to uninstall it again.
Uninstall Windows 7 SP1
The Windows 7 Service Pack 1 Beta is listed among the other system updates in the Programs and Features section of the Control Panel.
Open the Control Panel by clicking on Start, Control Panel. Locate Uninstall a Program under Programs and click on the link.

uninstall sp1 beta
Locate and click on View installed updates in the left sidebar. Find Service Pack for Microsoft Windows (KB976932) in the listing, right-click it and select Uninstall.

uninstall windows 7 service pack 1
Confirm the uninstallation of the service pack 1 beta. Windows 7 will start the uninstallation process, this can take anywhere from a few minutes to half an hour depending on the speed of the computer system and the background processes.
A restart is required after the uninstallation to complete the process. This restart can be postponed, it is however advised to restart immediately to avoid problems during that period.
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the “Evaluation Copy” text will be displayed on first startup after you uninstall the service pack. However, this text will not appear after the next startup.
http://www.hackandsecure.com/2010/07/16/what-you-must-know-before-installing-service-pack-1-beta-of-windows-7/
thank you very much for sharing, the update is real ****.
If your copy of windows 7 is not genuine it will brand it as Non-Genuine when you start the computer and when you run some programs.
It then cannot be removed or restored to an earlier time.