The only thing I can think of is Removing all calls in the registry. Just be very carefull, as you can destroy your operating system if you that. The simplest way is of course RegEdit from start ---> run.
Then do a search for KB891711. Delete it, and then find next. Repeat for each referance to KB891711. You should be able to do the same for the other programs. I'm not sure If this will work but It's worth a shot. Once again, If your not familier with the registry, don't do this at all, as you can really muck up your OS with just one wrong move.
Outside of that, and following ToastyO's idea, you can try to re-install the programs , and then Do the add remove from the control panel. That might do everything automaticly, and It's alot easier.
Stephen