Testers of the beta versions of Microsoft Windows' operating systems may notice a small watermark in the lower right-hand corner of the desktop above the Taskbar. This watermark simply displays the beta build version of the system. If you prefer to run a beta version of Windows rather than purchasing the official release, you may want to remove this watermark. You can do so by making a change in one of the Windows registry entries.
Launch regedit by going to the Start menu and clicking on "Run." Type "regedit" in the field and click "OK."
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Expand "My Computer" in the left-hand window. Expand "HKEY_CURRENT_USER." Expand "Control Panel." Click on the "Desktop" folder.
Open the value "PaintDesktopVersion" by double-clicking on it in the right-hand window.
Change the "1" to a "0" in the "Value Data" field, and click "OK."
Close regedit and any other programs and restart your computer.