I have Windows 7 Pro 64 bit on an old HP. I took a 44 Mb video on my SG5 phone; too big to email, so I transferred it to computer with usb cable. Video plays, but no audio. When played on the phone, there is audio. Whether I play it on the computer from the phone via the usb cable, or the file that I transferred to the computer, there is no audio. Other files on my phone have audio when played on the computer, but this doesn't.
Another issue is that there were thumbnails images when I first connected it to the computer. It all of a sudden reverted to list of files.