Try fixing this problem by troubleshooting it with Add-ons disabled - IEBlog : Troubleshooting and Internet Explorerâ€™s (No Add-ons) Mode
You can also reset IE 8's settings by going to Tools > Internet Options, then the 'Advanced' tab, and then clicking the 'Reset...' button. That may work.
These instructions might solve your issue as well:
How to troubleshoot Internet Explorer issues in Windows Vista and in Windows XP - How to troubleshoot Internet Explorer issues in Windows Vista and in Windows XP
How to optimize Internet Explorer - How to optimize Internet Explorer
I hope at least some of this info helps,
MSFT Internet Explorer Outreach Team