The reason you are getting those messages is your using a pirate copy of vista! Its loading a program to get around the activation issues of using a pirate copy of vista and the mac partition makes it get confused. You would not get those messages if you actually bought an original copy of vista.
Well if you do actually buy vista I would not bother getting the 64 bit version. The bootcamp drivers are really for the 32 bit version right now, so you might have problems with some of the hardware in windows.