''hotfix'' restores to an unfixed state. You don't want to do that. There are removal tools to get rid of the backup folder Windows creates when applying these patches. Once I am happy that the patch has caused no problem, I just remove them manually. These are found in the Windows folder with a name such as $NtUninstallxxxx etc. Just delete these. There will be a corresponding log file something like KB9876543.log and these can be trashed as well. They will disappear from add/remove. Save them in the recycling bin for a time and empty later if you want to play safe.
I have a list of Windows XP Hotfix in my ADD/REMOVE section, can I remove these safely without corrupting my system?