I've burnded two short (2 min) DVD's using DVDA, one on a Pioneer DVD-RW and one on a Pioneer DVD-R. I want to play them in a computer. I've tried the DVDs in three computers: two computer won't play them at all (crashes Windows Media Player and the Dell player) and in the third computer, a new DELL Dimension 4600, gives an error that the DVD player has the wrong region code for some such. What would cause these two DVDs to not play?