When running SETUP.EXE you get the error "Setup has detected that unInstallShield is in use. Please close unInstallShield and restart setup. Error 432".
This can happen on Windows NT (and 2000 and XP). You have to have administrative rights on your PC. InstallShield tries to delete UNINST.EXE from the \WINNT directory (so that it can install the latest version). If you don't have the rights to do this, it will presume that unInstallShield is already running, and gives that message.
Full instructions can be found at: