There can be many reasons. If you think you changed a setting you shouldn't have, and can't remember that SMSS needs PhysicalMemory, CSRSS needs terminate, etc etc. The next version will not allow you to make volatile changes to critical programs like the above though A couple of people have needed to uninstall in Safe Mode after changing those ! You could suspect a malware is in your SECURITY list or worse, in your PROTECTION list. Or just want to clean things up - too much in your list and want to reduce it, by resetting and then running through the setup guide / Learning Mode again.
