How can i disable system generated error messages using my c# application

Question

Hi friends,

       I was created a windows application to block the applications in pc. The application blocking was done but when clicking on blocked applications, the system generating a dialog box saying "The operation has been cancelled due to restrictions in effect on this computer. please contact system administrator". My need is i dont want to display this dialog box to user. how can i disable it. 

Thank you,

Psk