WORKAROUND #1:
1) Use the same installer to install Toad again.
2) Use the installer entry in the Control Panel | Programs and Features window do uninstall Toad. Since Toad should be the only product listed in the installer entry, once it is uninstalled, using the installer entry, the installer entry will remove itself.
WORKAROUND #2:
See attached Word document for a way to remove installer entry without having to install Toad again.
STATUS:
Waiting for an enhancement to be implemented in future installers.