Just Cause 2 Requires you to play through a pogrram called Steam. Steam is nothing but a connection to the PC gaming community. Steam doesn't effect the game play at all, including Graphics and Frames per second. If you aren't sure about purchasing, you can download the Just Cause 2 demo from Steam itself, which is an accurate representation of how the full game will run. If your having trouble downloading, these are the steps I took.1)Download Steam from Steam's Website.2)Purchase the Game from Amazon3)Instead of using Amazon's Down-loader,go to Your Amazon Account and then Your Games and Software Library . View your Games Activation Key 4)Open Steam's Game Library. At the Bottler left corner you will a Option to ADD a Game . Click on that.5)Chose To Activate a product or game and Insert the Game's Activation key you viewed from Amazon.6)At this point your download will begin on Steam. The download took me about an hour and a half.It is a slight drawback using Steam to run Just Cause 2, but believe me the game is worth it. I would recommend this game to anyone in a heart beat. **I cant Stress this enough. First try out the demo on Steam**