I am interested in dual booting window's 7 32-bit and ubuntu 12.04! how to do partition's?

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http://askubuntu.com – i intend to use half harddisk to win7 and other to ubuntu my pc info 500 gb HD [250 for win7 and other for ubuntu] 4 gb ram! amd phenom II X2 555 processor 3.20Hz! i am confused how to do partitions i will install winds 7 first after it ubuntu! needed help! Thanks in Advance! =) (HowTos)