Delete your temporary internet cache. Open up an IE window, click tools->internet options, then click 'delete files' and check the 'delete offline content' box.
Erase all of your cookies. Open up an IE window, click tools->internet options and then click 'delete cookies'.
Lower your privacy level on cookies perhaps. Although this is sometimes not recommend, it may work. Open up an IE window, click tools->internet options, click the 'privacy' tab and then move the bar accordingly.