Orange box restarting my computer

Just purchased the orange box for PC and it keeps restarting my computer during gameplay. Anybody experienced this issue before?

 

Greetings, geek_1337.

Which of the games is causing the problem?

And, more machine info might prove helpful: operating system and service pack #, make and model # of your system, type of video, amount of RAM, etc.

 

Machine: Emachine w3410
OS: Windows XP Home SP3
Graphics: Radeon Xpress200 (integrated)
2gigs DDR Memory

I've had this problem on Half-Life 2 and Portal. I haven't tried any of the other games because of this issue. Also, whenever I start the games I get a warning that my graphics driver is out of date. I updated it but it doesn't seem like the game can tell that I did. Also, I don't get any error messages. The computer just restarts.

 

UPDATE:

Uninstalled and reinstalled the graphics driver again. Tried HL2 and it seemed to work fine for quite a while and then my computer restarted (note: after reinstalling the updated driver I didn't get the message saying my driver was out of date). When it got to my desktop, my resolution had changed and I got an error saying that my system had recovered from a serious error. I'm starting to think that the games do not like my integrated graphics.