Help needed on how to get the patch

[rakinroll]

Originally Posted by JG14_Jagr

When you get STEAM and actually use it for a while you'll realize there are some very good features.. one thing I love is that I can add a new HDD or reinstall my OS to get rid of all the clutter and just log into my STEAM account and it automatically re installs ALL my game content.. thats a HUGE convenience..

Could you please explain it mate? I am planning to upgrade my system and i do not know what exactly should i do. Game and steam in the second harddrive and i only will format first one which OS loaded. Should i uninstal and reinstal the game after upgrade?