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How install Dual Boot after Win 7 has been installed
I am using Windows 7 home premium. I would like to have a dual boot system so that I can boot in XP or Windows 7. I already have Windows 7 installed. I like it and it is working fine, however, I want to do some beta testing of Office 2010. Optimum situation would be to install an older copy of XP I have to a parition on an external USB drive. When I boot my Dell, press F12 and have it allow me to pick the partiion on my USB drive to run (XP).
I have googled Dual Boot Windows 7 but almost all the tutorials have to do with XP being installed first and creating a partition for Windows 7, the opposite of what I want to do.
I know enough to know if I mess this up it can have unpleasant ramifications. Just trying to find some detailed instructions specifically for what I want to do.