I need help not getting suspended!?

While the communications via TOR may be encrypted, the files that you receive can still be infected and can still cause a lot of trouble, bot just your every day viruses, but rootkits as well. Its not a matter oe being too lazy to remove a few viruses, but removing trojans and rootkits can occupy tremendous amounts of time as anyone who has ever spent hours cleaning up a relative's computer knows. While your network may be licked down tight, software run on a machine inside can phone out, and set up reverse tunnels to allow other computers in (this is whole principle behind how VPNs operate, allowing a foreign computer into a trusted network). I know it is not what you want to hear, but those computers are not yours. If you want to use software that falls outside of the scope of the class being taught, use it at home. If you are using someone else's computers then play by their rules. It might be minor to you, but that is the way the real world works. When you get into the workplace, you will find the same thing at many places. What you did, like it or not was install unauthorised software on a system that is not yours that CAN (regardless of what you want to make yourself believe) compromise the security of the system itself. I think expulsion might be a bit harsh, but revocation of computer privs and detention do seem fair. You broke the rules. Be an adult and face the consequences like a grown up. Its good practice, and you will find out that its an inconvenience now, but won't make any real difference in the long run. If you do this in the real world, it could mean unemployment. Its a lesson well learned.