bandwidth monitoring

Hello, I'll be moving into my college dorm tomorrow and found out that we're limited to 2 gb up/down per day restarting at midnight. If we go over this we get a warning then the banhammer. Any programs to reccomend that will allow me to monitor my daily bandwidth usage(for windows, please)?

Holy hell!
Limited data quantities? In bradband century? Where tha hell do you live?
I get 12mbit without any restriction for about 45 bucks per month.