[ubuntu] Advice on how to go about installation on this machine

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http://ubuntuforums.org – hi there, I recently got a new laptop and would like to dual boot like i did on my old one (which was windows xp and ubuntu) new laptop has windows 7 and in considerably better than my old one (and more complicated it seems) and to be honest is confusing me slightly. laptop info: ASUS K55VD, x64 based, 6GB ram, intel i7-3610QM, BIOS version: american megatrends inc. k55vd.304 first problem is i'm not sure how to partition up the hard drive, mainly cause it already has four primary partitions: efi system partition, OS (C:), DATA (D:) and recovery partition my other issue is (Hardware)