IE 9 works only with Windows 7 and Vista. There is no XP version. There is no upgrade.
Get rid of any previous version of Internet Explorer in XP and install Firefox, Google Chrome or Opera.
IE 9 is the most secure Windows browser.
IE 9's Tracking Protection Feature lets you set your browser so advertisers can't track you, in theory, though not 100 percent accurate.
IE 9 runs fast, on par with Firefox and Google Chrome, at least for me.
IE 9 looks great, easy to use.