just got a h.264 16ch dvr set up ok I think but when I go to backup images they wont play back .to backup it has a usb port which I have connected a external dvd writer ,ive then burned off the images . then gone to playback on laptop .it is in removable devices when I open it it has two files videoplay and some numbers .I installed the videoplay and when u open the numbers you 0000001 dat file 00000002 dat file etc but cannot open files any help thanks