This instructable will show you how to get free copies of hl2:dm and hl2: lost coast note: this will only work if you have an nvidia card in your computer and it only works once.
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Step 1: Verify...
go to http://www.steampowered.com/nvidia/ and click (get it now)
Step 2: Download Steam...
A window will pop up and ask if you have steam. if you do say yes if you don't say no and it will start to download pretty straight forward
Step 3: Install Games...
When your done installing steam it will automatically install and it may take a while due to band with and internet speed so you might want to set it up to install before you go to work or school.