Sorry, honestly I completely forgot this thread. So, back to the business.
Really, if you have not modified the base (and you normally shouldn't!) it's enough to move this so called normal, personal vhd. Base is base, it's same on every installation of XP Mode. You could also merge the differencing disks before moving, and use the resulting merged vhd as a stand-alone XP vhd. About merging the fixed XP Mode base vhd and the dynamical vhd, read this: http://www.sevenforums.com/virtualiz...tml#post711304
About your password problem, two things to remember. First, if integration is enabled, XP Mode requires password. Only when integration is disabled is it possible to use user accounts without password.
Second, by default XP Mode allows only administrators to log in. If you want to add limited user accounts, read this: Virtual PC XP Mode - Add Limited User Accounts
Could that password problem of yours be a human mistake, a typo? I mean, when you uncheck the option "User must enter a username and password to use this computer", it asks the admin password once, so IMO you had to give it there, at least once? If so, it sounds not right that login screen did not accept the same password you had to give to change that setting?
Anyway, I'm checking more often in here, so please tell how it all went, if you got it running?