How to dual boot Windows Vista and Windows 7 (Vista installed first)
James Bannan20 January 2009, 12:00 PM
Got your hands on the Windows 7 beta and want to dual boot it alongside Windows Vista? Here's our step-by-step tutorial to get you up and running with Microsoft's latest OS.
Page 3 - Now Install Windows 7

If you used the GParted LiveCD to shrink the Vista partition, you'll need to reboot the system from the Windows 7 install DVD. If you've used DISKPART then you just need to click "Install now" and continue the installation. There will be two install options - Upgrade and Custom - select Custom.
Once the install gets to the install location, there should be at least two options: a partition marked as Primary and Unallocated space. Select the unallocated space and click Next. The install will then commence.