I'm no expert on these matters, but it's probably a security setting withing IE. I don't like or use IE so I can't make any good suggestions as to what settings to mess with.
I would however suggest downloading and using Firefox instead from now on. It's a more stable browser and is supposedly a lot more secure as far as viral infections and what not go. http://www.mozilla.com/en-US/firefox/personal.html
If anything seeing if Firefox works will probably help identify whether or not it's a problem with your computer, or a problem with the browser. Hopefully. Hope this helps.
Edited by Doug E Fresh, 18 May 2009 - 02:50 PM.