I have a Compaq Presario Notebook PC. The disc drive has always worked fine but today I noticed it wouldn't open. I discovered the little light in the front was not blinking as it usually does when I open the tray. I did some investigating and found that there is no CD-DVD drive listed under "Computer" in my start menu. It only lists C: and D:. When I checked the Device Manager I found that there is no CD-DVD driver listed there. I recently installed Malwarebytes but I don't know if the driver was missing prior to the installation. Other than that, nothing has been installed or uninstalled on this computer. Any suggestions?