Hi, I've been running Ubuntu 12.04 and I'm looking to install Windows 7 to dual boot. Here's my drive layout:

* /dev/sda1 (boot) /
* /dev/sda2 extended
** /dev/sda5 swap
** /dev/sda6 home
** /dev/sda7 ext4

* /dev/sdb1 ext4
* /dev/sdb2 ntfs <-- install here

sda is a SSD that I initially freed up a logical partition on. Windows 7 didn't like this, so I freed space on the HDD sdb, a primary partition. Still it won't take. I think it needs a //system// partition.

Is this true? What's the easiest route do you reckon?