Hello, welcome to just answer!
what operative system do you have?
I have windows vista
ok, then please click on this link
then click on Software under Download Center for SGH-A687
in the end download the second file clicking on the icon on its right
if you want, you can also download Samsung PC Studio, to help you manage your phone and data
let me know if you need more help on this, otherwise don't forget to accept the answer if you are satisfied with it
I have the driver installed, but now I can't figure out how to start the transfer of the pictures from phone to computer! I don't have a memory card - is that necessary?