If you’re running the Insider Preview of Windows 10
http://lifehacker.com/how-to-switch-…
That watermark can be useful (since it shows you what build you’re running), but if you’d rather not see it anymore, just download Universal Watermark Disabler below, start it up, and click Install. (We recommend backing up before doing this, since it does alter system files.) It will sign you out and back in, and the watermark should be gone.
To bring it back, just start the utility again and click Uninstall.
Universal Watermark Disabler | via Ghacks
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