The Windows XP Service Pack 1 is now available from the Microsoft servers. This official SP is based on ‘build 1106’ and it weighs 133 MB. Some users have noticed a snappier interface along with the bug fixes, new drivers and features included. The official announcement is expected on Monday. Update: OSNews reader James, sent us a screenshot with the error message you get when trying to install SP1 on a pirated WindowsXP copy.