I don't have an UNINSTALL.KOF on my system.
(XP Home with QT7 Pro)
The uninstall shortcut in my Start menu targets:
"C:\Program Files\Common Files\InstallShield\Driver\11\Intel 32\IDriver.exe"
/M{3868A8EE-5051-4DB0-8DF6-4F4B8A98D083}
(I don't know if that key would be different on your system.)
Maybe uninstalling through Control Panel | Add_or_Remove_Programs works.