Runtime/stack overflow errors basically indicate that a running program tried to perform an operation in an incorrect manner. This could be due to a bug in the program, a software conflict, or a number of other things.

If you give us more specific information concerning the circumstances under which this error occurs we'd be able to help you resolve this more quickly. For instance, you didn't even tell us which version of Windows you're using or what this clipart CD is.

Please post as much info as you can; it will help us all.