UPDATE. I uninstalled Hoster and Microstudio and deleted the MTU folder in the registry. Rebooted and reinstalled Hoster. That worked. Reinstalled Microstudio...worked. I had never installed Karaoke Pro, Keyrite and Vogone, so I thought I'd give them a try. Installed all three programs. Karaoke Pro wouldn't open "Error #1 Call MTU support". Then Microstudio & Hoster wouldn't open. Same original problem. I uninstalled all MTU programs and registry entries again. Rebooted and only reinstalled Hoster and Microstudio. Both programs are working properly for the time being. I'll try installing the other programs one by one and see what happens. I'll keep you informed. Thanks for your help.
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