Well now I do think that installing CDBurnerXP on my system messed something up. I uninstalled CDBurnerXP, but ImgBurn is having the same problem. ImgBurn can burn a DVD fine - it gets recognized on my XP machine, but my 2000 machine doesn't recognize the disc. In fact, if I put any DVD into the drive now, including a DVD movie bought from the store, Windows says "E:\ is not accessible. Access is denied". ImgBurn and Windows were working fine before I installed CDBurnerXP, so I think CDBurnerXP messed something up on the system. I have tried uninstalling the DVD drive from Device Manager, and then having Windows detect it and reinstall the driver, but that didn't fix the problem. Any ideas on how to fix this?