dual boot

I have a Pc with Win NT, Win 2000, Win XP installed. All configured to be connected to a network with a domain. The Pc name is same for each OS. The IPs is same too. Each time an OS is selected, it requires that the account for the Pc is created again on the domain. It only remains permanent only if yhe same os is loaded again otherwise, I have to create the acounts again. What’s wrong? Why can’t the account be retained for all the OS?