Try running IE in No Add-ons Mode. Go to Start -> All Programs -> Accessories -> System Tools -> Internet Explorer (No Add-ons) - If this fixes the issue, then go to Tools -> Manage Add-ons and enable the add-ons one by one to find which one was causing the problem.
You can also try resetting Internet Explorer's settings by going to Tools > Internet Options and then the "Advanced" tab, and click "Reset..."
If youre still not having any luck, I recommend you reinstall IE8 on your system
Does that solve the problem?
IE Outreach Team