Internet Explorer 9 is the most secure browser to use on web. If are using IE8 on windows 7 platform, Id recommend upgrade browser to IE9 as it is faster and safer than IE8. IE9 use SmartScreen Filter that is designed to protect you from web and social engineering threats. Its dynamic security intelligence and safety service protect you from all type of phishing attacks and malicious software. It also works with Download Manager to help protect you from malicious download. You can upgrade browser directly from Microsoft website to keep your PC secure from all kinds of online threats. Thanks
