Hi Margaret
go to the task bar start and right click on computer select properties
then select device manager when it opens select DVD/CD drives open it by clicking on it and right click on your CD drive then select uninstall at this point reboot your computer after it has been uninstalled and it will be found again when the computer reboots and reinstalled if you still have the problem you would then be better of backing up your files or your hard drive if you can I use acronis true image for this but you do need a second hard drive for that its always usefull to have a second hard drive to keep these files on any way because most viruses attack C drive and not the second drive also a good quality USB flash drive ( I use corsair flash voyager 16 GB)
they come in various sizes 2-4-8-16 GB look at the size of you files and get some thing suitable for you they are very easy to update
you would also do better to get a DVD drive so you can backup to that, blueray is even better 25 GB disc's and 50 GB disc's, flash drive or DVD drive probably your cheapest solution for now
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