Instead of installing new Internet Explorer I strongly recommend to have a look Firefox 2.0 instead.

This is going to be in the news all over today.

http://www.microsoft.com/ie 

Someone has created what Microsoft should have created, web developers and desiginers can now test their website without loosing IE6.

Run IE7 and IE6 at the same time without having to overwrite the previous version.

Internet Explorer 7 RC1 in standalone mode.