Infocus lp425z projector pushes latop display to left quarter of output image

Recently acquired an InFocus LP425Z projector; it works quite well with a DVD player, with a bright and sharp image. However, when hooked up to my computer's VGA output (with the CableWizard adapter) the image from the computer monitor is compressed into the left quarter of the projected display. Talked to the help desk at the InFocus 800 line; adjusted the computer's resolution and made certain the connections were snug. No joy. I tried both CableWizard 2 and CableWizard 3; no change in output. This projector has the proprietary (non-standard) socket for connecting the VGA output with the CableWizard. Help desk suggested trying a VGA to RCA video converter in order to make use of the video input socket used by a DVD player. Does anyone know how to get this device working correctly with the regular VGA input? Thanks!