I recently purchased a set-top dvd recorder. I want to take DVDs burned from this unit and rip them onto my PC. I am using Slysoft's AnyDVD and CloneDVD2/CloneDVD Mobile software, but they are getting errors when trying to open the VOB files. Upon cursory inspection, the discs produced by the set-top box appear to have the same structure as pressed or copied dvds. Any ideas or suggestions?