IE 7 is free to download and also features optional plug-ins so that you can add tools for improving things like downloading and security.
If you currently use a different browser such as Firefox, you can install IE 7 without affecting your other browser.
Users of Windows XP with Service Pack 2 can download the IE 7 setup file from www.microsoft.com/windows/ie/
If you have Automatic Updates enabled on your PC you will receive IE 7 as an update. You will be given the choice to install the program or not.
Alternatively, visit www.windowsupdate.com and choose the Express install option which will download any necessary updates including IE 7.