i've been backing up some of my dvds using "1clickdvd" software. the playback on some of the disks seems as if they are dirty. it gets really choppy and i get the little out of place squares dancing around the screen. i can pull the disk, put it right back in and play the same section of the movie and it will playback fine. i only copy the movie without any extras. i'm wondering if anyone would know if this is a hardware, software, or media problem. thanks in advance for any help.