You must have a program called WEBUPDATER on YOUR computer for it to recognize your GPS
It's free from Garmin here:
Plus you'll get updated firmware too
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To download the latest unit
software visit Garmin website: www.garmin.com/webupdater
After installing WebUpdater once from the Garmin
website, perform all future software updates from your computer. Simply connect
your compatible Garmin device to your computer, then run WebUpdater from your
computer's "Start Menu" by selecting "Start",
"Programs", "Garmin", and finally "WebUpdater"
REMEMBER: It takes hours to
do a complete a map update.
Unless you bought the Lifetime maps you may have to pay for current maps.
Does this help? Let us know. Thanks.