The Mangler 2 (2002)

Joanne 'Jo' Newton, a girl desperate for attention from her workaholic father ends with her going to private school after a break in at her dad's computer company. The school is under going tests of a new security system. Jo and several others students are to remain behind while the others leave for Spring Break. Little does Headmaster Bradeen (played by Lance Henriksen) know, but Jo has hacked into a computer and has unleashed a super virus called "Mangler 2.0" in the security system, but what she doesn't know is that this virus literally has a mind of it's own, and it controls everything around the school, so it is very capible of killing everyone in sight.