Windows Update for Windows 7
From CVL Wiki
There are two things you want to do, first make sure that your machine is up-to-date, and then setup the automatic scheduling of updates.
To make sure that your machine is up-to-date:
Click:
Start --> Control Panel --> System and Security --> Windows Update --> Check for updates
There are two types of updates, important (security related) and other types. We are mostly concerned with computer security, and these updates will always be considered "important". If there are any "important" updates, click
X important updates are available