Today we don’t scan our brain for a virus that it’s found on the Internet.
But in the future, after the brain will interact with computers software directly, we will probably need an antivirus to scan for such changes and to undo them, not before to do a full brain backup.
So if the antivirus messes things up to be a way to fix the situation.
Probably this will become an obligatory thing after you interacted with the computer directly.
A thing of protection can be a device inside our skull, that reads all our thoughts, so if you want to kill yourself and you are very sure that you want to do a jump, some kind of medicine to be released in your body to make you sleep until ambulance comes.