I need Some help.whenever i connect to the internet and connect to the other computer,its ok nothing wrong.whenever i play Cs or Counter Strike COndition Zero,the computer outside will restart!

How to solve this?
My PC SPECS

Intel Pentium 4 2.4 GHZ

512MB Ram

Inno3D 5000LE FX(I just tell u that this is PCI and is like just spoiled!)

Creative SoundBlaster

BareBone Casing

Start steam, right click, and hit monitor. Wait for all the games there to update and then try to play. If this doesn't work, go to Steam's website and get support from their pages or their forums .

U dont say that!I also play CS CZ N it also restarts!