Files and Folder SEARCH requests CD-DOM everytime I use it

I'm running Windows XP Professional SP2

When I click START, SEARCH, a window appears saying ( The feature you are trying to use is on a CD-ROM or other removable disk that is not available.) (Insert the Microsoft Office XP Small Business).

I insert the disk and hit OK and everything goes just fine but when I use SEARCH again the window appears again and asks for the disk again. Why does this keep happening. It used to work fine. Thanks Mike