While most other browsers allow you to install and run multiple versions of their browsers simultaneously, Internet Explorer does not allow you to do so.

But if you would like to continue to run your Internet Explorer 7 and at the same time install and try Internet Explorer 8, here is what you have to do.

Download the Internet Explorer Collection. This will allow you to install and run multiple versions of Internet Explorer on your machine. During installation, you have to simply check the versions you’d like to install.

Related Reads:
Multiple Version of IE
Taming Your Multiple IE Standalones
Running IE 6 In Windows Vista.