Most browsers save data from recently visited websites into a cache or temporary location on your hard disk. That can speed up operations considerably because the browser doesn't have to download all the information if you return to that site. But it also clogs up your hard disk and can prevent pages from appearing correctly, if pages have been updated or changed since your last visit. Fortunately, there are ways to remove those files.
On Internet Explorer 7.0:
On Internet Explorer 4.0 and above:
On Netscape Navigator 4.0 and above: