Just in case you are a webdesigner and you need a variety of Internet Explorer Versions on your machine, try Tredosoft’s Multiple IE.
It is possible to run Internet Explorer in standalone mode without having to over-write previous versions thanks to Joe Maddalone who came up with a way of achieving that in November 2003. Basically, Internet Explorer is run by exploiting a known workaround to DLL hell - which was introduced in Windows 2000 and later versions - called DLL redirection.

One Comment
does this come with the exploit/bugs existed in the previous versions ? that wouldnt be good.