Folks, I think I just figured out why ireboot is not working on my XP system but is working correctly on my vista system. I am using a program on my vista system called RollbackRX. Apparently it takes over the boot process at startup and does not recognize the XP drive. For whatever reason easybcd will not install on the XP version. After I install easybcd on XP and try to run it I get the error "valid BCD registry not detected. EasyBCD has detected that your BCD boot data and MBR are either not from the latest version of windows vista or doesn't exist"..... I know you said that easyBCD doesn't need to be installed in order for iReboot to run, however, since RollbackRX taks over the boot process, iReboot doesn't see the vista or Xp options on the iReboot menu in order to make a selection of either of the operating systems. As I said earlier iReboot works flawlessly in the vista operating system.
Thanks to all who responded.
baldwin