I have replaced my wife's laptop. We would like to give our old one to a grandchild who would use it primarily for internet. The specs are, Dell Inspiron 2200, 1.40 gigahertz Celeron M, RAM=768MB, 40GB HD. I wish to clear everything on the HD except the OS. I have cleared docs, pictures and every program I can (some will not delete). Of course I have dumped the Recycle Bin. It still shows only 3-4 GB open on the HD. Suggestions?