Does your drive show up in explorer under Computer? For instance your hard drive is most likely C: and your CD/DVD might be D: or E:
Look in Device Manager and check it shows in there. Also check for any errors flagged in there. These are shown by a yellow exclamation mark or a red cross.
To open device manager hold the Windows key down and press R. In the box that opens type:
devmgmt.msc
Then press ok.