In Vista Workstation you can create a new user and password using all characters of a keyboard. Vista Workstation allows creation but when you try and login to Workstation you get login error.
Using characters in the password field that Vista does not recognize.
Do not use the following characters in a password for users- ! @ # $ % ^ & * ( ) - = + , < > ' " ? \
The following characters can be used in the password field- _ . / :