Most of the computers that I have serviced over the years have forgot to update Windows. I suspect that most users feel it isn't beneficial. Imagine a 15% speed boost, some Windows updates have done just that.
To get started simply go to their website in internet explorer. Sorry other browsers don't work for this.
Install any high priority updates, or software updates of the programs that you use. The only thing I don't install is language packs and drivers, I get my drivers from the manufacturers website.
If you get prompted to turn on auto updates, do so, it will save you having to do this again. If you are prompted to restart your computer, do so and repeat the update process until you don't find any new updates.
Click here to go to Windows 7.
Click here to go from Update Windows back to Speed Up My Computer.
Click here to go to the Home Page.