Movies, videos and songs take up lots of space. Delete those that you don't want using Windows Explorer or My Computer. Then go to the control panel, add/remove programs to remove what you don't want. If you don't recognize something, I wouldn't mess with it. In Internet Explorer / Tools delete cookies and files. You may have to re-enter some information when you go to your websites but this will clean up what you don't need, too. Also, empty your recycling bin - click the icon on your desktop. These things should free up lots of space.