This is really simple I'm sure, but when a user clicks on the X in the window to close my application, I get the message "Cannot Quit VFP". How do I resolve that?

I also have one user who gets the following error message when starting my VFP Exe: "This program has performed an illegal operation and will be shut down." Our PC environment is all Dell systems that are supposed to be configured indentically, but this user receives these messages on a daily basis.

Thanks for your input