|Go to Start>Run, type devmgmt.msc and press enter. Device Manager appears.|
Is there a yellow exclamation mark beside any listing underneath DVD/CD-ROM Drives? Either way, right click the drive if it appears underneath DVD/CD-ROM Drives, and click Uninstall. Click OK on the confirmation box. Restart the computer and Windows will reinstall the drive on the next bootup. Check Windows Explorer again after it reinstalls the drive.