Au_.exe for those interested this is a bug that runs in the background to stop you from uninstalling 5kplayer the file is located in user/user name/AppData/Local/Temp/~nsu.tmp and all you have to do is delete this file then uninstall 5kplayer and be rid of it. You don't want dodgy software from companies that use their technology to make you use somthing 2nd class as these companies have no morals. Note Au.exe is part of windows Au_.exe is not.