Dunno if there are drivers for this phone in 64bit version of Win7. You might want to ask AT&T or Moto directly about that. If there are no drivers--you'll need to put the SD card in a card reader.
If there are drivers, you should just be able to follow the setup instructions with the phone, plug in a USB cord or make a BT connection, and the SD card shows up (with a short lag) as just another device in the "Computer" list of drives.