What antivirus programs do you have? Some of them need to be
uninstalled to stop them from causing problems, not just have a part
disabled.
Did you try both the 32-bit version and the 64-bit version of the hotfix?
Only one will do anything, but which one depends on whether you have
a 32-bit or a 64-bit version of Vista. It may not delete the stuck mail,
just make it so you can.