Possibly deleteing the cache?
1.Click Tools, then Internet Options, and then click the Delete Files button.
2.A Delete Files window will appear. Select the option to Delete all offline content, and then click OK.
3.Click Settings and reduce the size of your cache to, say, 50 to 100 MB (more if you routinely download very large files).
EDIT: I would stronly advise you to use Firefox though, alot better in many ways.