I have Windows 7 32 bit installed on a 64 bit Laptop. I am trying to install Ubuntu 12.04.I am trying to install Ubuntu 12.04 using USB. I created the bootable usb using live usb installer. I have 6 partitions in Windows 7 of which in Windows 7, I created a partition of 50 GB and also having an unallocated space of 50 Gb. I will install Ubuntu 12.04 in any one of these space.

When I am booting from USB and selecting the option of "Try Ubuntu" and In Ubuntu desktop, when I click "Install Ubuntu 12.04" , and choosing the option as " Something Else " ( I dont want to Install Ubuntu alongside Windows or want to erase Windows totally ), only 3 paritions getting listed. One is system memory reserved as 100 mb. Second is C drive and third partition is listed as a whole space ie remaining space of the entire hard disk is listed instead of partitions. I tried Gparted Editor and it also lists the same as Ubuntu 12.04

So whats the problem and how can I make the Ubuntu to detect all the partitions so that I can install in the unallocated space or in the 50 GB Partition ?

( P.S - When I try the same in my 32 bit desktop, it is detecting all the partitions )