Here are instructions on how to clear the temporary Internet files in Internet Explorer 9:

1. Select Tools > Safety > Delete browsing history…/.
2. Make sure to uncheck Preserve Favorites website data and check both Temporary Internet Files and Cookies then click Delete.
3. You will get a confirmation at the bottom of the window once it has successfully cleared your cache and cookies.
4. Close ALL applications and reboot your system to make sure you do not have any instances of Internet Explorer running.