I've read a bazillion posts with this title but still don't find one that quite matches my circumstances. Quite suddenly, my DVD drive and CD drive started showing this message whenever I tried to make a back-up copy of anything using Roxio Easy CD.... or 123 Copy DVD. Additionally, while both drives are visible in Windows Explorer neither one will display any contents. If I try to install software using either drive I get the message D:\ is not accessible. Incorrect function. Installed programs like Topo that pulls mapping data from a disc cannot find the disc. Windows Media Player, however, can see WMA files on a disc that I burned or the recording that it was burned from. It will play them just fine. It will still record to hard dive and will still burn a music CD. It will still play DVD's. Windows Explorer will not find anything in the drive, though. This is an e-machine 2865 w/ Athlon 2800 DVD-RW drive is NEC ND-1300A CD Drive is OEM F564E XP Home OS Roxio Easy CD is V184.108.40.206 Not sure the version of 123 Copy DVD No new software has been installed around the time that this problem showed up. Both programs were installed and working fine for way over a year. Anyone have any great ideas?