|Can be cone - although I haven't - yet... And as Vista is now effectively becoming recent history not likely to...|
Still if you trawl in google/yahoo etc. for:
dual boot vista and xp with vista already installed
you'll get a slew of useful how to sites/ references etc.
Saves me duplicating what's out there...
As system was XP originally, provided you have all drivers from earlier (or can obtain them again...) you didn't orta have any serious problems?