Multi-user systems are NOT a solution to malware. Multi-user systems are created for systems where there are multiple users, plain and simple. Using a "regular user" account (access roles) to block viruses is just a means to an end of securing a system. This conversation should really have very little to do with malware, nor should it have anything to do with anyone's personal setup-- none of those discussions serve as any justification to revert the multi-user functionality; end of story.
