try deleting it from your registry by:
open start menu > click run > type regedit > find it under > HKEY_LOCAL_MACHINE > SOFTWARE > then figure out who made the software, find that folder, delete it, then try to uninstall, if there is no folder, then goto program files or where ever its installed, and look for the missing .exe, if it is missing, delete everything to do with the program piece by piece and attempt to re install, i have had to do this with many programs...