How to Install Solaris 10 with Windows XP (Dual Booting)?

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I want to install solaris 10 with Xp.I want to dual boot it with xp.The installer is only detecting my primary windows partition and no other partition.It is showing my 20 Gb windows partition and rest 132 gb as "EXT DOS" partition.If i create any other partition,it says "you have to delete one partition and then create one".It is not detecting my free space.What should i do?i dont want to delete any partition. Please help me out. Any comments are greatly appreciated. Thanks in advance..!