From time to time I get the following message:
"Intrusion guard service has stopped working"
We are working on a solution, and a fix will be released through Internet Update soon.
For now, the problem can in most cases be worked around by going into Settings and turn off "Help improve product"
Update 23/10/13: A fix that should solve this problem has been released through Internet Update. If you are still experiencing this issue, please report it to your local Norman support department.