What exactly are you trying to do? If you are trying to access your CDrom Drive just type the drive letter in the command line.
C:\>D:
or
C:\>E:
This will put you in your CDrom drive, then do a DIR command to find the file you are looking for. IF you are looking to run a program from the CDROM, type the drive letter and the name of the program.
C:\>D:\program.exe
or
C:\>D:\setup.exe
Something of that nature
