Q: Is it possible to run Vista AND XP on the same machine??? maybe log into the OS that you want to use at the time???
A: Follow this http://apcmag.com/how_to_dual_boot_vista_and_xp_with_vista_installed_first__the_stepbystep_guide.htm or this http://apcmag.com/how_to_dualboot_vista_with_xp__stepbystep_guide_with_screenshots.htm