If you're using Windows 10 Technical Preview on your main machine, or just don’t want the hassle of reinstallation if anything goes wrong, now's the time to create a backup. Hooray! Start by grabbing yourself a copy of the tweaking tool from the Winaero website and then extract the zip file. You can enjoy your chosen desktop wallpaper in full, unadulterated glory. The suitably-named Universal Watermark Disabler is available free of charge, and can be used to remove the unwanted text from the lower right hand corner of your desktop.