Windows Update is the best way to keep your computer from becoming vulnerable to security risks.
Click here to go to Windows Update.
Click Start

Click Programs.

Click Windows Update.

If you get a popup window asking you if you want to install and run Windows Update, click yes.

Windows Update will start checking your computer to see what needs to be updated.

Click Express Install to automatically select all required and critical updates

Click Install

You can set your computer to automatically update without going to the Windows Update site, To do this;
If your using XP, Click Start

Click Control Panel

Click Automatic Update

Click Automatic and then choose a time of day that best suits you, after you enter your time click OK .

