Look for software problems first. Goto computer icon, right click for properties, click device manager in upper left.
In device manager look for yellow exclamation points? Do you have any? yes- Read what they say and post. no- then find the CD/DVD drive line and click it open. You should see your CD/DVD drive. IF not, post. If yes then highlight it and hit teh DELETE key. Save. Shutdown the system (not restart, shutdown to power off). Turn on computer. Win will find the CD and laod a fresh copy of the CD driver. Shoudl work now. If not post.