If you have Windows XP or Vista and you're currently using Internet Explorer 6 or 7, you need to upgrade to 8 without delay.
There is a new vulnerability being exploited that only affects Internet Explorer 6 and 7. With support for those older versions coming to an end, it's important to upgrade to the latest version.
Besides it's many security enhancements, Internet Explorer 8 is speedier than previous versions. Microsoft lists some of the improvements included in it's latest browser in Windows Internet Explorer 8: Get the facts.
Users of Windows 7 need not worry because Internet Explorer 8 is already installed in that operating system.