Why not simply uninstall Quicktime? It doesn't come back on its own. The
uninstaller works and doesn't bug you.
I'm not sure exactly what is happening in the interaction you are seeing,
but there's a more general issue that I'd like to touch on: Microsoft
Antispyware is not a general purpose tool to uninstall or block any program
that the user decides is unwanted on their machine. Lots of folks want
this--not least among them network administrators. However, this tool isn't
it, and it can't be. This tool removes software which fits a particular set
of criteria laid out in this KB article:
http://support.microsoft.com/kb/892340 Microsoft Windows AntiSpyware (Beta)
identifies a program as a spyware threat (Listing criteria and Dispute
process)
It doesn't uninstall all ad-supported software, and it doesn't uninstall an
arbitrary piece of software the user chooses to have removed. For those
things you need to use the add or remove programs entry in control panel
provided by the application vendor.
Is there some reason you can't use the uninstall for quicktime on your
system?