Windows 7 includes Windows updates and automatically enables them by default. Updating your system regularly is an important part of keeping your computer secure. Two options exist if you don't want Windows using bandwidth to check for updates. Change the update settings to check for updates without downloading them until you're ready, or set it to never check for updates. The first option is preferred since it makes it easier to remember that updates are available without wasting bandwidth until you're ready.
Open the "Start" menu and type "Update" in the search box. Click on "Windows Update" in the results that appear.
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Click the "Change settings" link on the left side of the window. Click the drop-down menu below the "Important updates" section. Select either "Check for updates but let me choose whether to download and install them" or "Never check for updates (not recommended)."
Click the "Give me recommended updates the same way I receive important updates" check box. Click "OK" to apply the changes.
If you've selected the option to never check for updates, don't forget to click the "Check for updates" option in Windows Update periodically to keep your system secure.
Unless you actively follow security updates, selecting the never check option means a security hole may remain undiscovered and unpatched on your system until you click the "Check for updates" option and install important updates.