[ubuntu] Help with Installation

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http://ubuntuforums.org – I have all the requirements for XP and Ubuntu.I have XP already with me. Yesterday, i have downloaded Ubuntu 11.10. Now i want both the OS on my computer. On installing, i don't see the option of side to side installing the OS. I have Samsung HDD and have 4 partitions. Ubuntu can't see Windows installed on my Desktop PC and says my Hard Drive is unallocated. It can't see my partitions. I used USB to install Ubuntu. If you want anymore information, ask me? What is the problem? (Hardware)