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Updating Windows can be done in two ways: first, by updating to the latest service pack, and second by using the Windows Update program. Let’s begin by discussing service packs.
A service pack (SP) is a group of updates, bug fixes, updated drivers, and security fixes that are installed from one downloadable package or from one disc. Service packs are numbered, for example SP1, SP2, and so on. Installing the service pack is relatively easy and only asks a few basic questions. When those questions are answered, it takes several minutes or more to complete the update; then a restart will be required. While the service pack is installed, it rewrites many files and copies new ones to the hard drive as well.