I use TV Box to connect my DVR (AVT 760) to my VGA Monitor.
The TV Box cost only 20 US$.
The other advantage of using TV Box:
1. It is an external box, so you can use it without have to switch on your computer.
2. The TV Box have 3 input channel (switchable with remote control): TV Antenna, Video Channel, S-Video Channel. And 1 VGA connector, which means: when you switch on your computer, the VGA monitor will function as computer screen.
3. You can watch TV, CCTV and DVD on the same VGA Monitor at the same time. Switchable from remote control.
Just Plug video cable to your DVR video output to the Video Channel input of your TVBox.