I deinstalled everything, cleaned the registry and the path, rebooted, reinstalled Oracle with admin privs, tested Sqlplus and SQL Developer successfully. Tried to install Toad with admin privs and got this:
I deinstalled everything, cleaned the registry and the path, rebooted, reinstalled Oracle with admin privs, tested Sqlplus and SQL Developer successfully. Tried to install Toad with admin privs and got this: