To access Windows Update, the following services must be enabled and running:
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Automatic Updates: Provides the Windows Update service.
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Background Intelligent Transfer Service (BITS): Used in the process of downloading updates.
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Event Log: Keeps a record of updating activities to help with troubleshooting.
To make sure these services are running:
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Close Legacy Update and any other programs using Windows Update.
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Press Win+R to open the Run dialog.
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Type
services.msc, and click OK.
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If a User Account Control dialog appears, click Continue or Yes.
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In the Services window, find Automatic Updates (Windows 2000 and XP) or Windows Update (Windows Vista and later).
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Confirm that the startup type is Automatic. If not, select Automatic and click OK.
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Repeat steps 3 - 4 for Background Intelligent Transfer Service and Event Log.
If you are running a modified version of Windows, these services may have been removed entirely. Legacy Update is not supported on these versions of Windows.