Hi Barbara,
Right click on the My Computer icon, then pick properties. Under the Hardware tab, pick Device Manager. Any problems with drivers will be indicated by a yellow or red exclamation point or question mark at that item (DVD/CD-ROM branch in your case) on the tree structure. If red or yellow at the cdrom branch, expand the branch and right click on the problem item. That will give a drop down menu that will allow you to try to re-install the drivers.
If any of this is not clear, just post back.
Best regards,
Mack1