The computer I am using at work is a Pentium 4, 3.o Ghz. Windows XP SP3. I don't know if it is more than 5 years old or not...
The display adapter is listed as a:
Intel 82915G/GV/910GL Express Chipset Family, which from a quick google search appears to be a 5+ year old chipset.
Fortunately, the videos we are playing are at a 320 X 240 resolution, so we don't have to worry about H.264. Even at that low resolution, the processor hits 100% during playback.
I will try to find an update to the display driver and see if that changes anything. Thank you