To disable lanschool functions / mess with it is simple.
PULL OUT the Ethernet cable... or
1) get a Linux/UNIX based windows password wiper livecd
2) boot into it, run the PW wiper
3) reboot without the CD
4) log in as administrator
5) delete lanschool
6) and if u have the time, get onto a teachers PC, while they aren't looking and copy the reg entries and files from their machine onto yours.
:)