These files are of visited web pages and junk. In IE, click Tools, Internet Options, and click appropriate the button under Temporary Internet Files. If you click the Settings button you can adjust how much space is allotted.

Removing these files once a week or so (if you're a heavy surfer) will improve IE's performance.

Good luck,

Telephony facts, analog/digital explained.
See the CNet faces behind the posts.

I think computer viruses should count as life. I think it says something about human nature that the only form of life we have created so far is purely destructive. We've created life in our own image. - - Stephen W. Hawking