MTUSND.VXD problem

[soundwookie]

On one of our MTU machines (we have 4, and not the one that I have started a different thread about), we keep getting the error about the "device=mtumsnd.vxd" in the system.ini.
We have had this problem on ALL of the other machines at some point, but have always been able to fix this particular problem by uninstalling and reinstalling me 5.5.
This is the process we usually use when reinstalling:

Uninstall Microeditor & Karaoke pro
shut down pc (not restart)
Re-install 5.5, shut down
reinstall karaoke pro.

Usually, this does the trick. We even tried the unplug trick, but that didn't do it either. When XP boots up after the unplug, it can't find the driver. What should I do?