Yes, it is free indeed.

Please, have a look at: http://www.mozilla.com/firefox/

I used to use IE and was sceptical with Mozilla (despite people recommending it to me), but have to admit I was sold to the cause. Makes browsing more 'enjoyable' if it makes sense - i.e. less crashes, less 'page not found' messages etc, and the tabs make surfing muchly better! + It is also better for security reasons. I rarely, if ever, use IE now tbh.