also what speed are you burning at? I would recommend about 8X for CDs, 4X for DVDs. The faster you burn, the more errors are possible. Do you have any other programs running when you burn, torrents running etc. I would recommend you restart, then run only the burning program, burn at a midrange speed, and use quality media. Memorex blows. Taiyo Yuden is the best, Verbatim is good, Sony is good.