Patch an uninstaller

[pocruadhlaoich]

Hi,
can anyone tell me if it is possible to patch an uninstaller already existing on customer computers?
I have an automatic software update system, and when the new installer gets downloaded by the customer and is run, it will check for a previous installation and if found, will call the existing uninstaller on the computer and uninstall the application prior to the new installer continuing its work.
A bug has been found in the existing uninstaller that is already on customer machines. Since the uninstaller has a bug, I do not want to run it but instead want to replace it with a correct uninstaller. Is it possible for me to have my new installer contain an "Uninstall.exe" such that when the new installer is downloaded and run, that one of the first things it will do in a certain scenario is find and replace the existing bugged uninstaller on the customer's computer with a new bug free uninstaller that has been packaged into the new installer?
Any help would be greatly appreciated.
Thanks,
Patrick