MSCDEX command provides access to CDROM drives under MS-DOS.
If you use MS-DOS (including MS-DOS attached to Windows 95/98/Me), and you want to access your CDROM drive from it, you can use MSCDEX to help you do that. Besides MSCDEX, you need a driver program for your CDROM drive. Usually, you can use a compatible driver program provided by Oak Technology. That driver lies in start-up disks of Windows 95/98/Me. Its file name is OAKCDROM.SYS.
To configure your computer to access CDROM drives, you need to install the driver first. Open CONFIG.SYS that locates in the root directory of your start-up disk, using a plain text editor. If the file doesn't exist, create it. Add a line in it: DEVICE=[drive:][path]OAKCDROM.SYS /d:mscd001. In the line, "[drive:][path]" specifies the location of file OAKCDROM.SYS. You can replace "DEVICE" with "DEVICEHIGH" if UMB is enabled before the loading of the driver.
Then, restart the computer, run MSCDEX /d:mscd001, and it will tell you the drive letter of your CDROM drive. If you have more than one CDROM drives, you can run MSCDEX /d:mscd001 /d:mscd002 ... instead of the command I showed above. Of course a corresponding change should be made to the device driver installing command in your CONFIG.SYS file.
Can you use your CDROM now? If you still cannot do that, ask your friends to help you.