You can use the Garmin Express program to update your GPS.
Click here: http://software.garmin.com/en-US/express.html
Click on Download for Windows (or Mac)
Run the downloaded program to install it then open the program.
Connect your GPS to your computer and the Garmin Express program will allow you to update it.
If you can take a minute and use the rating system to rate our session as 3 stars or higher and press Submit so I am credited with helping you.