i managed to install vista on a partition on my main hard drive using boot camp which works as usual and then installed windows xp on an external usb drive using a modified windows xp disc (google for it in not allowed to post a link). the problem is that as soon as you install windows on the external after installing vista on the boot camp partition, you can only boot into windows xp using the boot selector. this is the problem im having except i removed vista and now i cant even boot into xp.