I read HERE (thanks Naked Snake3) that NVIDIA (The graphics card production company) is giving away some free games to anyone with an NVIDIA graphics card.

I imagine this applies to both pre-installed (manufactured PCs), and separately purchased (user installed) graphics cards.

The Games:
Portal: The First Slice (demo)
Half Life 2: Deathmatch
Half Life 2: Lost Coast
Peggle Extreme

Total Size = ~6.8GB

I've set up a (free) Steam account, and my PC qualifies. I have a dated Nvidia graphics card, which came with my PC a couple of years ago.

Mind you, just because you qualify, doesn't mean your PC can run the games.

To get it, simply click on the source (at the bottom of this article), and near the bottom, there is a button that states 'Get It Now'. Click on it, and let it test your PC to determine if it qualifies. You need to make a Steam account first, if you don't already have one. If you don't have one, simply click on the button that takes you to register for your free Steam account, and install Steam (fairly quick process).

After you've passed the test, you can choose the games you want to download, and you're able to download them to any computer with a Steam account, providing you log into steam with the ID that the free downloads are registered to.

Note: It is for 'a Limited Time Only', though the expiration on the promotion isn't clear, from what I can see. There also may be exceptions that aren't clear.