Excellent guide, but beware I have to re-active Windows 7 after installing dual boot with Windows 8. Windows 7 came up not genuine, I had to enter the license key from my CD and activate again.
I don't know what the problem was but the first few times I booted into Windows 8 then rebooted back into Windows 7, I had to re-active each time.
With some tweaking using
EasyBCD, I was able to fix the problem.
Enjoy!!