An "illegal operation" error will generally (but not always) occur when two programs try to use the same resources on your computer at the same time. A regularly occurring illegal operation error is a good indication that your software was incorrectly installed, and may need to be reinstalled. A sporadic error is harder to track down.

The numbers that appear below the dialog box are the locations in the program that the problem occurred.

If you get an illegal operation error message, shut down the program in which the problem occurred, and restart your computer as soon as possible.

This should solve the problem.