For those of you who don't wish to use a password, you can allow blank passwords to be used on your computer, this way the only thing you need to insert when connecting to a printer is your username
[Start] [Run] and type gpedit.msc and click [OK]
Navigate to Computer Configuration/Windows Settings/Security Settings/Local Policies/Security Options
Double click on Accounts: Limit local account use of blank passwords to console login only.
Select the radio button next to Disabled and click [OK]
Thanks. that did work for me.
BTW, for those that have Windows 7/XP Home version, Group Policies Edit is not included. Use instead regedit and change to 0 the LimitBlankPasswordUse parameter on the entry MACHINE\System\CurrentControlSet\Control\Lsa