How can I update the Windows operating system?
To update Windows XP:
  1. Open Internet Explorer.
  2. Go to http://update.microsoft.com.
  3. Click Express.
  4. Click Install Updates.
  5. Restart if prompted. You may need to run Windows Update multiple times in order to fully update your operating system.

To update Windows Vista or Windows 7:
  1. Click the Start button, type update and click Windows Update.
  2. Click Check for Updates.
  3. Click Install Updates.
  4. Restart if prompted. You may need to run Windows Update multiple times in order to fully update your operating system.