Computer Crashing, PLZ HELP

My computer crashes when i'm playing newer games. I have tried many things to fix it and nothing seems to work. what happens is when i am playing the game it starts to lag then is fine then aftr a bit lags again, and finaly the computer freezes. I have updated windows and my drivers for everything. I reformatted to see if that woudl fix it. I installed anti spyware and virus(nortan and microsoft). I have tried many different games like WoW, Doom3, Warcraft 3, Unreal 2004. Everything freezes randomly. I try fixes for each game but nothing works. Is it my card or hardware or what could be wrong? I am incredibly frustrated. sometimes when it freezes windows will not work. Sometimes it takes 3-4 tries to reboot the computer. I have tried memtest and no errors were found but i stopped it after about 20 hours. I am running windows XP pro. Is there any way i coudl get more information from the error logs?

Error i got in event viewer, could this be the problem? I have 2 hardrives in this computer one i do not need, should i disconnect it?

 

From the description of your problem, it sounds like over heating when the graphics card is put under a load. Take the side cover off your computer and direct a floor fans output into your case and see if that helps your problem. Any device labeled 0 on an IDE channel will be the master device. Hope this helps!

Pardon me Halo, I was talking with someone while posting ( takes time ) and didn't see you!

 

I did not build it myself i got the computer from ibuypower.com and the other hard drive is disconnected, any idea what those errors mean or why it freezes everytime?