I work at a school and it sometimes amazes me what people are capable of.
I got a call the other day from a teacher who runs a computer lab here. Several of the computers, including her own, were crashing and freezing for no reason. I went down and looked at the student computers first, and after removing bonzai buddy, napster, gator, and other choice programs they seemed to work about as well as a 486 can.
I then went to the teachers and asked her how her problems began. "Well I was typing in Word and the screen froze, so I turned the screen off and left it for about half an hour and when I came back and turned the screen back on it was still frozen."
Thinking that strange I asked her if she turned it off or pressed the reset button. She then pointed to the power button on the monitor! I explained that in the future she should restart the computer itself, rather than the "screen". As I sat down at her computer she added on final little factlet, "Well this all started a few days ago after I installed Bonzai Buddy, could that have something to do with it?"

Students doing this stuff is one thing, but the staff knows they shouldnt be installing any POS program they get off the net...