The Microsoft support pages offer several suggestions relating to this problem. However, the possible solutions vary depend upon your operating system and the version of Internet Explorer you're using, so I'll simply suggest that you try your own search for information here:
http://support.microsoft.com/
Alternatively, if the problem is fairly recent, trying running System Restore to take your computer back to a date before the problem arose.
Anyway, most of the 'regulars', here in AB's Technology section, gave up on Internet Explorer ages ago. We nearly all use Firefox. It's free. It's more stable. It's more secure. It's more flexible. Pages load far, far quicker. Why not give it a try?:
http://www.mozilla-europe.org/en/products/fire fox/
Chris