keyboard mouse disabler

i am looking for a peace of free software i have seen around before that disabled the keyboard and mouse from being used. The only thing is when they were disabled you could still watch anything like messages scroll by in irc, or watch a movie without anyone being able to take control unless they knew the key combination and the password to use the computer. I had it a while back and i loved it but since my pc has crashed and the addition that i have since moved the computer to a new location where kids can get to it i need that peace of software again. I have been searching for hours but i have not seen anything remotely close to what i am looking for. any help would be great. note: this is a windows machine!