DL2 Content freezes with error message.

I recently had a DL2 video card go bad on an original '06 manufactured unit. We ordered a new computer from highend and installed it along with the new video card and the hauppauge video capture card. We are using the old power supply and the original hard drive. Ran the most current recovery image successfully, but after a few minutes of playback the server locks up and this message is displayed.

Dl2:dl.exe application error.
The instruction at "0x0062246b" reference memory at "0x00000000". The memory could not be "read". Click on ok to terminate the program.

I have ran the recovery disc twice now and continue to get the message after a few minutes use. Any ideas as to what's causing this?
Thanks,
Josh