For the average user, if you have Automatic Updates enabled your computer will download these updates for you in the background. Then when you shutdown these patches will be applied to your system. If you leave your computer on overnight they will automatically be installed and your system rebooted if necessary.
Warning: Before you leave your computer at night make sure you save all your work or it will be lost if your system has to be rebooted.
Enabling Automatic Update
If you don't have 'Automatic Updates' turned enable I would suggest that you turn it on as soon as possible. If you don't want to enable Automatic Updates, you can always update your computer by visiting the Windows Update site and downloading and installing the patches manually.
To enable Automatic Updates:
- From the Start menu, select the Control Panel folder.
- Double-click the System applet in the control panel folder.
- Click the 'Automatic Updates' tab.
- Check the 'Automatic (recommended)' option. (optional: if you don't like this feature, you can set it to: 'download but not install the update', 'just notify you', or 'disable this feature altogether' [not recommended])
- Press the OK button when done.
Note: For the latest Microsoft Security Bulletins, check out this site.