Dual boot ing pre-installed Windows 8 and windows 7?

Hi there
I have a lenovo G505s that came with windows 8 and would like to download windows 7 and have them dual boot for gaming purposes so I was wondering I could get any advise on the matter.

Welcome to the forum!
With Windows, generally you have to install the older version first then the newer with dual booting.  Since you already have Windows 8 installed that might be a problem.  Also resizing the partitions on your hard drive to make room will disable the option to use One Key Recovery at boot up.  If the machine is still under warranty, you might wait till the warranty expires before re-arranging things.  Also prior to installing Windows 7, make sure there are drivers available for your system's hardware.
Owner & Operator of the following:
● Lenovo Ideapad Z570 w/ Win 7 & Win 8.1 Dual Boot ● Lenovo Yoga 3 Pro w/ Windows 8.1 ● Toshiba A75-S206 w/ Win 7
● IBM Thinkpad T-23 w/ Win XP ● IBM Thinkpad T-22 w/ Win XP • As well as multiple desktops dual/triple booting XP, Vista and Win 7.
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