"Blocky Resolution: on MP3300

I am running a DVD from a desktop PC to a MP3300 projector.  The DVD is playing full screen (using Dell Player) but the resolution is very "blocky".  I have played with the PC display settings, but this does not transfer over to the DVD so I am assuming that there is a problem with the projector settings.  I have looked at the manual, but nothing is jumping out at me as being the problem.

Any suggestions are appreciated.