Hi all - thanks for the replies - my pc is quite decent - Winxp pro, SP2, Pentium 4 3gz, 1g RAM, so it should be more than capable of multitasking! In any case, playback is still choppy when playing a dvd when nothing else is running ( on more than one piece of software too - WMP, VLC, BS Player ). So I know its non a software issue. I may try cleaning the lens as to be fair theres a lot of dust in the area of my PC! if this fails, any other suggestions!? Thanks in advance!