Install ubuntu 11.10 with win7 [closed]

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http://stackoverflow.com – I want to install ubuntu 11.10 along side with windows7, I have already installed win7,My Hard disk(600GB) contains 6 partitions. I want install install ubuntu to a separate partition,but when I try to install ubuntu. it shows only 2 partitions, C(100GB) driver and another partition which already taken the rest of the space(500GB).I want to install ubuntu to a free partition (100GB). I can create new partition from 500GB, but I am afraid to do that, because my other partitions contains data, could any one help me to figure out this? Thank you (HowTos)