[ubuntu] Dual boot

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http://ubuntuforums.org – Hello all, I am new to Linux and Ubuntu and generally new to another OS than windows. But, I would like to dual boot Ubuntu on windows 7. I have downloaded the Ubuntu installer and I get the option to install Ubuntu alongside Windows 7. Will I get a choice everytime I start up my PC to what OS I want to boot in? And when I boot in Windows will I still be able to use it as if I never changed anything? Im a heavy gamer hence why I would like a dual boot, and I have an average PC wont this affect my gaming on when I boot in windows either? (Hardware)