I have Windows Xp and Windows 7 on two different hard drives in my Mac Pro. Windows 7 had been working fine, but I needed XP to run some older programs that 7 couldn't do. I have been working in XP some time now but when I try to boot from the Windows 7 drive it just reverts to the XP one. Even when I click on the Windows 7 drive to make it the start up drive it still goes to XP. Is there something I'm doing wrong? What is the issue here? Thanks for any help.