So I got a 320GB HD and decided I wanted to do XP/Vista 64bit dual boot on it. I already had an OS installed so I poped in the drive and partitioned it 150/150GB. Then I restarted with just the new HD and installed XP on the first partion. Everything went fine and I installed some drivers and got it running. Next I shut down and booted into Vista's setup. I formated the second partition I had made and put Vista on it. Again everything went fine. It booted up into vista and I did some post config set up. I then restarted after a windows update or driver install (not sure which). When my machine was booting I never got a boot manager. So after getting into XP again I restarted and watched intently. Again no boot manager and the machine boots directly into XP again. I opened up boot.ini and didn't see another OS listed so I copied the line and modified it so I should boot into partition 2 which is Vista. Restart and now I have 2 options... HOWEVER if I click XP it boots into XP... If I select Vista, the computer restarts... I can't get into Vista it seems, so I cannot modify the BCD. I don't believe the boot.ini is even able to boot into vista. I have a few questions: Can I modify Vista's BCD from XP? Has anyone else had a similar problem? Did I go about the installation of the 2 OS's wrong, and how can I remedy it? General suggestions on this problem?