A service pack for Microsoft Windows operating systems is a major update package of smaller updates that have occurred since the operating system was sold. These major roll-ups of updates are very infrequent and serve to save you time in having to install a large collection of updates individually. It is recommended to install all service packs that are available for your current operating system so that your computer has all of the fixes and patches available installed and are thus more protected from instability and being taken over by viruses, spyware and malware as well as adding other system and application updates.

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