Ask the QuickTime folks: http://www.apple.com/quicktime/

"Ashdog" <Ashdog@discussions.microsoft.com> wrote in message
news:1CB1D627-D226-4CDB-9543-89DE7569693A@microsoft.com...
> Hello - I have Quicktime 7.4.5 running on a 64 bot machine (Running
> Windows
> XP, Professional x64 edition, V. 2003, SP 2).
>
> I need to uninstall Quicktime so that I can a do a new install of the
> Quicktime Alternate.
>
> The basic Add/Remove program "successfully removes" Quicktime, but when I
> go
> to run the Quicktime Alternative installer, it fails to start with an
> error
> message, "Setup detected you already have Quicktime installed. You must
> unistall Quicktime before you can install Quicktime Alternative."
>
> Any thoughts?