[ubuntu] Installer doesn't detect WIN7 partition

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http://ubuntuforums.org – I'm trying to install ubuntu alongside windows 7 but the installer doesn't recognise the windows partition. In windows I used the disk management tools to shrink my C: and then left the free space unallocated. I then tried to install ubuntu using a usb stick, however it only gives me the options to completely wipe the hdd or customise the partitions (However when I go into the custom partitions it just shows the whole 1tb drive as being empty) So I tried googling for a solution and found several different solutions (run chkdsk in windows, remove dmraid) and I have tried both of these but ub (Hardware)