Here's how to do it from start to finish.
Start the Recovery Console
Run fixboot {
drive}
Run fixmbr
Exit Recovery Console and Reboot into XP.
Go to Start > Run and type in msconfig
Go to boot.ini tab and remove vista entry
Save the file
Reboot.
No screwing around like PC Eye is famous for. For some reason he misses steps (in this case fixboot) or doesn't get them right at all and does everything the hard way (like trying to screw around with editing the boot.ini properties and contents).
EDIT: Because he'll argue until he's blue in the face, call me names, tell me I'm wrong, throw irrelevant Google links and cut and pastes at everyone, tell us about his AST 486 and his custom IBM interfaces, I will add a link that outlines what I just told you.
http://www.tech-recipes.com/microsof..._tips1040.html