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Either use the link above to download SP1 (the huge ISO file in the list applies to all Windows 7 computers), or use free WSUS Offline Update to download and install all necessary prerequisites, SP1 and latest security updates.
Windows Vista computers require Service Pack 2 to get latest updates from Windows Update.
Users on a corporate network or running an illegal copy of Microsoft Windows may be unable to perform Microsoft Updates.
If you are on a corporate network, contact your administrator if you are concerned about updating your computer.
In most cases, automatic updates and the latest drivers are available online.
Other updates correct errors unrelated to security, or enhance functionality.Windows Update automatically patches security holes and brings software and stability updates (if set to do so) and therefore enhances your computer's security.