CD or DVD drive hide or disappears in Windows 7

By default, Windows 7 automatically hides the empty drives in the Computer folder. This can be verified by inserting a disc into the drive; it should automatically make the drive visible in Windows.

SOLUTION

Follow these steps to make your DVD or Blu-Ray drive permanently visible:

How to use System Restore in Windows 7

Log on to your computer as an administrator.
Open the Control Panel by clicking Start, and then clicking Control Panel.
Click System and Security, and then click System.
Under the Control Panel Home menu, click System protection.
If you are prompted for an administrator password, type your password. If you are asked for confirmation, provide confirmation.

Click System Restore.
Recommended Restore is the default choice. This restore is the most recent restore point and the best place to start.
To choose a different restore point, click Choose a different restore point, click Next and then click a restore point.
Click Next, and then click Finish to confirm your restore point.
To start the restore process, click Yes.
Once the system restore is complete, your computer will restart.
If the most recent restore point doesn’t resolve the issue,select the next restore point. Any software installed after the restore point will be lost and you'll need to reinstall it.