This one is weird and occurs on every computer I've tried. I have a dvd with files that I am copying to my harddrive (.vob). The first time I copy them everything is fine. However, when I try it again with a different DVD (same type of files) Explorer freezes up, becomes unresponsive, and/or tells me the files cannot be accessed. I've done this with 4 different computers. They all allow the copying of the files one time and then have the same failures from that point on. I've restarted the computers. I've shut them all the way down. I've created new accounts and tried it. All to no avail.