Iâ€™ve just installed a Liteon DVDRW SOHW 1633S but when I play a DVD on it the sound quality is poor and it lags behind the picture. When I play a CD the sound is fine. I know very little about computers so this may be a very simple problem, but because of that I havenâ€™t even got as far as burning anything. I have a 902MHZ Processor, 320MB of RAM, a new 40GB HDD, and Windows XP Professional Version 2002. Has anyone else experienced this problem and if so can someone help me solve it? Thanks, Dave.