I just found someone else’s reply, and it looks like you have to turn on the guest account and restart the service to get it to work. Just go to Control Panel > Users > Guest account > Turn On, then go back to command prompt and type “sc.exe stop AirPrint” without the quotes, then type “sc.exe start AirPrint” without quotes again and it will show up without a padlock.
For all with authentication issues who wish not to enable the guest account or add a password to your existing account. On Windows XP, Vista and 7 (x86 and x64) you can use your account that does not have a password by:
1. Go to Run (windows key + r), then type in gpedit.msc 2. Go to Computer Configuration / Windows Settings / Security Settings / Local Policies / Security Options 3. Double click on Accounts: Limit local account use of blank passwords to console login only 4. Disable this option
NOTE: This only works on the professional and business versions of Vista and 7 like the Ultimate and Enterprise editions. A work-a-round for users of premium and basic editions would be to use Regedit (windows key + r and enter “regedit”) and look for the key of: “HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Lsa\limitblankpassworduse” and change the character from 1 to 0.