I am trying to open a tax form online that requires Reader 9. I've got Acrobat 8.1.3 installed. I've also installed reader 9, but the form reports that the version is 8.1.3 and asks me to update again. When I try to open Reader 9 from the start menu, Acrobat 8.1.3 opens.
This is on a work PC (XP SP3) so I probably have a commercial license and I can't uninstall or upgrade Acrobat. How can I force the document to open in Reader instead of Acrobat?