Vista - Vista won't upgrade even after Services for Unix 3.5 is removed

Hi ,

I'm trying to upgrade to Vista ultimate, but the machine i'm upgrading HAD
Services for Unix 3.5 on it, Vista complained it couldn't complete the
upgrade until this was removed, so I ran the un-install from add/remove
programs and supposedly un-installed it and rebooted. Then I re-ran the vista
install and tried to upgrade again and the damn thing still thing Services
for Unix 3.5 is installed. is there some kind of 'scrubber' to get all fo the
Services for Unix 3.5 bits out of my system so the Vista upgrade will run?