Both my cd drives (dvd and cdr/rw) out of no where did not appear in my computer. In device manager they have error code 31 which means is a driver problem and it means a device they rely on has a problem. no other devices have errors. its not a hardware problem because i can boot off both drives and this problem happened simultaneously. i ahve unplugged/uninstalled and replugged/reinstalled the drives to no avail. i have repaired win2k files and absolutely nothing happened.