How to get rid of "windows file protection" pop up?

a "windows file protection" pop ups in my computer all the time.it never goes away.
Update: The pop-up says: "Files that are required for Windows to run properly have been replaced by unrecognized versions. To maintain system stability, Windows must restore the original versions of these files. Insert your Windows XP Professional CD-ROM now." The problem is that i dont have the CD-ROM... show more The pop-up says:
"Files that are required for Windows to run properly have been replaced by unrecognized versions. To maintain system stability, Windows must restore the original versions of these files. Insert your Windows XP Professional CD-ROM now."

The problem is that i dont have the CD-ROM needed. Can i actually just ignore this and prevent this from re-appearing?
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