I am assuming that the DVD plays normally on the display of the Dell 745.
Then the issue(s) may be with the:
1. Networking configuration/set-up of the Dell and/or the Epson;
2. ethernet cable;
3. configuration/set-up of the projector or the Epson itself.
A couple of things you can try:
1. Optimize your networking throughput.
1.1 Increase your PCI Latency Timer to 128 or 255 in the Dell's BIOS/CMOS setup (if present);
1.2 Try running DRTCP.exe
appropriate to the Dell's OS;
1.3 Disable all other networking activities on the Dell. This may include auto updates, security/antivirus checks, etc. while running the DVD;
1.4 Slim down Dell's startup programs to bare minimum;
1.5 Increase your OS' swap file to roughly double your onboard memory
2. Try running a hub midway between the Dell and the Epson.
3. Verify that it is not the Epson that is problematic by playing a video source to the projector’s Video or S-Video port. If it is, then you have narrowed down the problem to the playing capability of the Epson.
Alternately if all else fails, perhaps you can try using:
1. a DVD player to the projector’s Video or S-Video port; and/or
2. a USB external DVD drive or a CompactFlash card (with a copy of the movie) direct to the 1815p
while settling the main issue.
Hope this be of help/idea. Pls post back how things turned out or should you need additional information.
Good luck and kind regards.