i am useing a liteon dvd burner, it had been doing a great job burning movies until last week. i am using nero, and i also use. 1 click copy dvd. Now bboth will not copy dvds. They burn about 30 percent, and i get write error,and burn error on both. i have uninstalled and reinstalled software, it does no good. it burns cds, no problems. i was told i could have picked up a virus in software, i don't downlaod music or movies from the internet. Burner is about 9 months old.
You could try checking your DMA settings in Windows, and make sure that your drive still has a high-speed direct link to memory which is more important for DVDs than CDs. However, I wouldn't rule out a bad drive at this point, which is common in DVD drives that get constant use.