I've uninstalled Labview 6.0 however, Run-time engine is still listed under the Add/Remove wizard in windows. I've manually unistalled it successfully but, it reappears, even after reboot.
I would suggest re-installing the Run-time Engine and then uninstalling it after a reboot. Also, you can download a program called Msicuu.exe (for NT, 2000, XP or Msicu.exe for 9x) to help clean up the registry for uninstalled programs.
Randy Hoskin Applications Engineer National Instruments http://www.ni.com/ask