Prassi (ones) software trial keeps locking dvd rom

I downloaded the free prassi software and installed it on my pc its a dell 4400 windows xp, liteon 167t,pioneer 108.prassi picks up all the hardware ok but when I try to record a dvd from the liteon to the pioneer I keep getting the following error.THE DEFINITIVE TOOL FOR CD/DVD MASTERING ENCOUNTERED A PROBLEM AND NEEDS TO SHUT then shuts down and the liteon locks up and I have to reboot to open it,if anyone else has come across this problem and sorted it please let me know :wink: