Somewhere on the first tab in the internet options menu is a button to delete the internet history. It can be configured. Make sure to delete the cookies too.
Or do the real thing: Download CCleaner and have it clean your whole system. It's amazing how much crap this little program finds, but you have to take the time to tell it what to clean before you run it the first time. Very useful, but you have to be aware the stuff it kills is gone for good. No chance to change your mind.
If you've never used such a program you should learn to use it. I bet it finds 10 GB of rubbish, especially old system restore points (-> hidden in a different menu in CCleaner).