answer:What do you mean exactly? have you removed the DVD unit physically from the machine, or are you talking about the device manager in the control panel? I get the feeling it is the latter, but when you say “removed from my computer” it sounds almost like you physically took it out. Assuming you are talking about the device manager found in the control panel, you need to reinstall the hardware. here is how: Go to your start bar, you will see a place you can type. and type “hdwwiz”. this will open up the add hardware wizard. Once the add hardware wizard is open, press “next”, and then select “choose hardware from list”. Once the list shows up look for your dvd in the list, then press next and follow the instructions. If this does not work, you maybe need to install the drivers from a cd or dvd that came with the pc. If none of this helps, let me know, ill try to help more. and if you mean you physically removed the dvd unit from the pc tower, let me know and ill also try and help. if you have removed it physically, photos will help me help you. EDIT: you will have to restart the computer after you add the hardware again using the wizard.