Hi,
You won't need to uninstall Notation Player - that's a separate installation. The specific steps regarding Composer would be:
1. Delete the setup file (NotationComposer263Trial.exe) from your computer, whether it's in a download folder or on your desktop.
2. Use Windows "Uninstall software" feature to see if there are any entries for Notation Composer, and uninstall them. There shouldn't be, but it never hurts to be thorough. If you do find something to uninstall, reboot the machine after the uninstall procedure.
3. Redownload the setup file from
this link.
4. Now try using the freshly downloaded setup file to install the trial version of Notation Composer.
One other item to note is that some flash drives and Vista don't get along too well. If you're trying to install the trial version of Notation Composer from a flash drive, you might want to first copy the installation file to your computer's hard drive and then run the installation from there.
ttfn,
Sherry