NIS 2012 Firewall program control

Whenever I try to change the program access in the the firewall (program control)  I get an error message saying: "Symantec Service has stopped working. A problem caused the program to stop working correctly.  Windows will close the program and notify you if a service is available." NIS 2012 shuts down and I have to reboot to get it to run again.

 

This happens whenever I try to change the access on any program.  Any ideas on what I can do?  Running on Windows 7 Home Premium 32 bit. 2.4MHZ core 2 Quad processor with 4.0 Gig memory.