From: http://windows.microsoft.com/en-us/internet-explorer/products/ie-9/features/smartscreen-filter

   Smartscreen Filter also works with Download Manager to help protect you from malicious downloads. 
   Potentially risky downloads are immediately blocked. Download Manager then clearly identifies higher 
   risk programs so that you can make an informed decision to delete, run, or save the download.

   We recommend that you turn on SmartScreen Filter. You can turn it on or off at any time. 
   You can also help improve the web for everyone by reporting suspected malicious sites.

From: http://www.modern.ie/en-us

Introducing modern.IE A new set of tools to help you support modern and older versions of Internet Explorer

http://social.technet.microsoft.com/Forums/en/w7itproappcompat/thread/abaf5c58-6428-4f50-a85f-dcaed96261f7

http://answers.microsoft.com/en-us/ie/forum/ie8-windows_other/message-is-this-tab-has-been-recovered/44ee5faa-1718-46e4-b60f-e3ed29e00b94

http://forum.maxthon.com/viewthread.php?tid=82300

Recently certain pages will not display or only partly. I noticed this behaviour on IE8 as well – and I cannot get it right.

Examples:

http://www.aarp.org/ no presentation at all

http://www.vitalitools.nl/nl/tfa/30202802_thermometer.php

IN IE8 one can hit F12, opening Development Tools. Under tab DISABLE one can switch OFF/ON CSS, Pop-Up Blocking and SCRIPT.