The RC1 watermark in the right corner is set by user32.dll.mui. The user32.dll.mui file is situated in your '\Windows\System32\xy-XY' folder (accordingly to your installed language): on english based systems in 'en-US', german = 'de-DE' [, ...]. Here are 2 solutions to stop this Watermark being displayed: I.) Modify user32.dll.mui by yourself (for instance with ResourceTuner or similar programs) or II.) Replace original user32.dll.mui with a patched one