Download steam from http://store.steampowered.com/. Install it and create a new account. Then go to the shop and search for the game you want, and you'll be able to buy that game.
I have a big problem with my CS 1.6, i start CS and everything goes good, when i tab away (suppose i just wanna check my msn) it's cool, but when i try to tab back to CS my computer just shut down.Anybody know what the problem could be?Btw, i have a non-steam CS on my computer to (for LAN).