http://www.half-life2.org.uk/check.php
Half-Life 2 : System Test
Results
Processor: Your processor is fine.
Graphics : You should be able to play in 1024x768 depending on your card, consider upgrading if you have an older chipset such as GeForce 3 Ti
System Memory: You have enough RAM
Operating System: You will be able to play on Win XP.
Architecture: No Problems
Please don't forget that you need a DirectX 6 compatible card to be able to play Half-Life 2, a DirectX 9 card will however give much better graphics.
Moi sa passe nickel youpi!!!!!!!!