Kishore: glad to hear the tutorial was helpful
Tom Wylde: The Vista drive needs to be the active drive, and it needs to be attatched while installing XP. If they are both connected, there is no problem installing XP on the 2nd drive.
As for errors, in bcdedit.exe, if you could post the exact error, as well as the line it resulted from, I may be able to address the problem as well as find a solution.