IE 9 is only for window 7 or window vista operation system. but if you have window xp then download VPC means virtual pc and run it to window xp. and then use ie9 version into your window xp pc.
Microsoft finally released Internet Explorer Application Compatibility VPC Images for IE9
The Win7+IE8 image is about 2.6GB but the Win7+IE9 is 4.3GB. There’s some extra tools in the IE9 one but they certainly do not add up to the 1.7GB size difference.
download the Win7+IE8 and then upgrading to IE9.