- Sometimes, it's easy to upgrade to the latest and greatest version of a piece of software. Other times, you may have a lot of trouble. That's the fun of working with software. Microsoft rolls up a whole bunch of patches and bug fixes, and throw them out there. Those are called service packs, of course. Windows XP is on service pack 3 currently. Louis from the PCPitStop community wrote in to ask about a compatibility issue with XP SP3.