Just made the switch from Iphone to the Galaxy S4, and while I was ready to move away from Apple in general, it's been painful.
Plugging in the S4 to my windows 7 machine, it doesn't get recognized. It tries to install the software from the phone, but 1 fails, and then the USB and the machine doesn't see it. Of course I am at work and I read everything specific to it, but spent some time on tech support. They had me download the Samsung USB drivers from their site and reboot..same problem. Of course my car doesn't see it either when I plug it in to the USB, take it back to AT&T, she plugs it into their work computer and the machine sees it of course.