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Summary: Create a dual boot system from a preloaded Windows Vista machine using XP or Windows 2000 by shrinking disk space on the C drive in order to allocate room for a second operating system. Avoid creating a dual boot system on a computer unless you're experienced with having dual operating systems with advice from a network engineer and IT specialist in this free video on Microsoft Windows Vista.
Joey Brakefield is a field implementation and network engineer for Spheris, a Franklin, Tenn. medical transcription company. Graduating in 2007 from Middle Tennessee State University,...read more
"Dual booting from a pre-loaded XP or Vista machine, doesn't matter, will be the same process as I showed with dual booting Windows Vista along side XP. You'll go through computer management, and then click on local disk storage and it gives you the graphical representation of the C drive. You right click on the C drive, go to shrink volume, shrink it down to however large that you want your primary C drive to be after you allocate free space for the XP installation. So, for instance if you had a hundred and sixty gig drive, I'd recommend that you pull it down to one twenty total for the C partition, so then the free space available for XP to operate and install onto will be forty gigs, which is ample space for an operating system. Again, I don't recommend that novice users do this. If you need to install XP, I would recommend you using a virtual environment."
eHow Article: How to Create a Dual Boot System From a Preloaded Vista Machine By Adding XP or Windows 2000