After installing SP2, only administrators can print. Other users receive:
You do not have permission to use the selected printer. If you need access, contact your network administrator.
To resolve this issue, grant the users group write permissions on the %SystemRoot%\System32\Spool\Drivers\W32x86\3 folder.
NOTE: After an administrator prints to this printer, the problem is resolved, and you do NOT have to grant the users permissions.