1. Does the behavior persist if you start IE in No Add-ons mode? To start IE in No Add-ons mode:
Troubleshooting and Internet Explorer’s (No Add-ons) Mode:
http://blogs.msdn.com/ie/archive/2006/07/25/678113.aspx
2. Does the behavior persist if you Reset IE Advanced settings (RIES)?
http://support.microsoft.com/kb/923737 <= Read before using!
3. What anti-virus application or security suite is installed, is your subscription current, and is it supported in IE8 and Win7? What anti-spyware applications (other than Defender)? What third-party firewall (if any)?
4. Has a(nother) Norton or McAfee application ever been installed on this machine (e.g., a free-trial version that came preinstalled when you bought it)?
~Robear Dyer (PA Bear) ~ MS MVP (IE, Mail, Security, Windows & Update Services) since 2002 ~ Disclaimer: MS MVPs neither represent nor work for Microsoft