| are you using the boot loader that comes with XP or a bootloader that usually is used with linux (lilo or grub)?
 Which OS did you install first?  If you installed linux first, windows won't give you the chance to boot a different OS, but if you loaded windows and then linux, the linux bootloader will let you do whatever you want.
 
				__________________"You hear the one about the fella who died, went to the pearly gates? St. Peter let him in. Sees a guy in a suit making a closing argument. Says, "Who's that?" St. Peter says, "Oh, that's God. Thinks he's Denny Crane."
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