i have a dynex DVD-r/rw 8x CD-r/rw 40x writer, it was working fine for a few weeks untill i wanted to play a dvd and it wouldn't play it properly, it would be choppy and not good. then i tried burning just a standard music disc and it wouldn't buffer properly so it would take longer than the usual time. and also, while i burn a disc, it slows down my whole computer to the max. HELP PLEASE!