How can I run Steam?
I have two partitions, one with Windows 7 and all my games, and other with Ubuntu.
I want to play my Windows Steam games without having to download all the games in my Linux Steam.
Is it possible ?
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Steam have no native version in Gnu/Linux. Maybe you want to install it by Wine or PlayonLinux. Your Steam games are installed on your Windows partition, because Steam did it. Of course, you can mount your Windows partition on Ubuntu, and launch your game manually by double-clicking on the .exe which will be using Wine. In my opinion, if you run on a dual-boot, it is better to run your Windows Steam games on Windows, because Wine is a good solution for apps like Office 2007 or Internet Explorer which does not require a good configuration, but if you want a good experience when playing a game, just don't use Wine, and play on Windows.
I have answered this already, and other people did too.