Yes, it sound too good to be true but there is loads of fun stuff which can be downloaded at no cost.
Try these programs (I use them on my computer and I've had no problems).
Mozilla is a safer alternative to Internet Explorer. If you got fed up with Window's constant security alerts, try this instead.
Open Office is a free alternative to Office and does the job at zero cost. Just be careful as it is a very big file. If you are in my class I can give you a cd.
Audacity is free software for recording and editing sound files and if you want to record students it is very useful.
Winamp is a free audio player which is much easier to use than Windows Media Player.
DVD Shrink is a way of making copies of DVDs without hassle