The following are the list of methods to fix this issue:

• Drivers must be installed again: By heading to Start, Control Panel, System and Security, System, and then Device Manager, you can REPLACE the drivers for the CD/DVD drive. Expand CD/DVD-ROM Drives, now right-click the device and select Uninstall from the drop-down menu. When you restart your computer, Windows should recognise the disc and reinstall the drivers automatically. If your hardware does not appear in Device Manager, you may have a hardware issue, such as a defective CONNECTION or a dead hard drive. If your computer is old, this is a good alternative to consider.
• Examine the BIOS settings: If you were recently in the BIOS, double-check that the drive wasn't accidentally disabled. This is extremely uncommon, although it can happen in rare circumstances. This is particularly true if you entrusted your computer to others for repairs or other services. Make sure the CD/DVD ROM drive is at least listed as an option on the Boot options page.
• Upper/ LOWER Filters Problem: If your Windows XP or Windows Vista system is unable to identify the CD/DVD drive, you may be experiencing a common issue that will not appear on any computer that has received the most recent Windows updates. To fix the problem with Windows XP and Vista, you must update two registry entries. You have the option of downloading the repair from Microsoft or doing it manually. You have to delete the upper filters and the lower filters and restart your device.

• Run the Troubleshooter for Hardware and Devices: If you're having trouble with Windows 7, try running the Hardware and Devices Troubleshooter. This will instantly diagnose the issue and attempt to fix it. This will most likely only work if the CD/DVD drive is visible in the BIOS and Device Manager, but not elsewhere in Windows. You have a hardware or connection issue if you don't see it in those two areas. By heading to Start, Control Panel, and then typing troubleshooter into the search box, you can start the troubleshooter. Select TROUBLESHOOTING from the drop-down menu. Finally, click Configure a device under Hardware and Sound. When you click Next, Windows will automatically detect and attempt to resolve any issues.
• Registry edit: If none of the above methods works, you might attempt editing a registry key that has been removed or corrupted.
• Drive letter: You should also double-check that the drive does have a drive letter assigned to this and that the letter hasn't already been occupied by another device. To see whether the drive letter is leading the drive to show up now, read my earlier post on how to alter drive letters in Windows.
• System Restore: If you're still having problems and your drive was showing up before but is now missing, you can try doing a system restore to a time since it was working properly. A new SOFTWARE package can sometimes corrupt your system, causing it to stop recognising your CD/DVD drive.