Hi I edited my Windows startup sound using Resource Hacker. I did it by editing the imageres.dll file. and changing the .wav file that plays when Windows starts. A few days ago I had a number of Windows updates install. Afterwards the startup sound was back to the original. So today I changed it again. I made a copy of the imageres.dll file on my desktop and edited it so it plays the sound I wanted. I then renamed the one in the Widows System 32 folder to imageres original.dll . Then I copied my edited file into the folder, it appeared. The file I copied in now plays the original Windows sound not the one I put in. If I open it with resource hacker it is back to it's original configuration. How is this happening I don't ever have to reboot, as soon as I copy it in it changes back. Mike PS. I repeated the process in Safe Mode and the file I copy in still changes to the original configuration. When I rebooted, (Resource Hacker won't open in safe mode for some reason) the original Windows sound was back!