Hi there and welcome
The software you require on your computer is called Garmin Express.
It is free and you can download it from my link below
Once installed on the computer, the computer will then detect the watch and be able to communicate with it.
If you have any problems, or would like any additional information or assistance, please do not hesitate to let me know.
Else if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.