[MTUSUPPORT]

There are two different files here that you could possibly be talking about. The first file is the MTUMSND.VXD, if this is the file that is giving you the error message, then try rebooting your computer, after the installation of Microeditor 5.4. If you have rebooted, and you are still having problems, then you should uninstall Microeditor 5.3 completely and try to reinstall Microeditor 5.4 again, from the start. (There is no such Microeditor file named MTUMSND.DLL)

If the above is not the file giving the error message, then try to remove the MSND.dll file, this would only be installed if you had installed Krystal as your Multimedia audio card. You can remove this by going into Control Panel, Mulitimedia, Audio, then Click on Microsound Audio Driver, and Properties, then click Remove, then reboot the computer.