Easy to dual boot windows 7 #1 and Windows 8 #2, just like dual boot in XP and Vista or XP and Win 7 or Win7 HP and Win 7 Ult.
you can not do it with the upgrade offer.... you have to find a standard edition of Windows 8....
1. while in Windows 7 - insert the media and when ask to install - continue to where your ask to "UPGRADE" or "Custom" chose Custom and select a new partition..
then you will have the option to chose your boot OS...
2. you can swap the default boot by using MSCONFIG...
my current boot is:
Windows 8 Pro (F:\Windows) : Current OS;Default OS
Windows 8 Ent (C:\Windows)
PS: you can also have X86 on one partition and x64 on another Partition...
