Your computer might not have enough power with a 350 watt supply.
The motherboard and processor alone will use about 250 at least.
BUT... do you know how to open the bios
You may need to set the correct configuration for the video card in the bios
. A lot of times you can reset the video aperture to a larger size using the bios
setup. This increases the video memory.
How many MB is your video card?
OR instead of using the game full screen, try reducing the window size to 3/4 or 1/2 screen or even smaller.
and then check if the same problem happens.
If a p4 processor overloads the cache memory, this could be the problem. reducing the screen size may prevent it from overloading the P4.
This is why gamers use quad core processors. The P4 does not have enough capacity to run complex video full screen sometimes.