One of our schools asked me to create a video on how to delete cookies, cache, etc from web browsers. Although this is a picture of my mac, it will be the same for the WIndows versions of Firefox and Chrome.
To delete browser history, cache, and cookies on Internet Explorer (version 9), please follow this link:
It is important to do this at least once a month if you heavily use the Internet. I do this sometimes even once a day when sites do not respond as I think they should. It does help.
Here is the video...enjoy