Bryce not allowing me to render in quicktime..

When I try to render quicktime in 7.1 I cannot edit the settings and when I click the checkmark the screen flashes and then it goes back to the editing screen. AVI is unacceptable for 1080p. Also I think it has a 4 gig file limit.
Comments
You nee to have at least QuickTime 4 installed on your computer.