Unable to alter or remove password.

[Guest]

When I attempt to alter, remove or change my primary password under the users
interface I receive an error that windows is unable to change the password.

I can create a new user, create, alter and delete it's password.

I have also noticed that I have a "switch user" button below my name when I
start windows, or return when screen save is active and my user name is
locked unless I use the "switch user" button.

I have just also been locked out from logging on to the same computer as the
only user visible was the primary user (mine) and that account was locked.
The system finally let me on after I left the login screen for about 5 mins,
it then accepted my password and let me log on.

I have not altered any settings in passwords or administrative local security.

Can someone suggest a solution?

I have also discovered that I am unable to create a password disk as the
password I have on my account is not recognized by windows.

 

[Guest]

Addendum:

Vista locks user password access if a program has written to the runonce
registry for a reboot and user has posponed the reboot. Silly me... Full
access is granted once rebooting has been completed.

I would like to know how to get rid of the switch user below pimary user
account log on screen?