Running IE7 Standalone

A friend of mine was running IE7 side by side with IE6. When he upgraded to IE7, IE6 was removed from his system. He is a web developer and he needed do tests on various web browsers. He told me he found a standalone package of IE6 and this is what he's currently using for testing.

I searched for sites that would give intructions on how I would be able to run IE6 in standalone mode. What I found was a site that shows you how to run a standalone package of IE7.