Microsoft itself knows that Internet Explorer (IE) is a burden some times and its very hard to remove it from windows installations.
Microsoft Windows 7 tracking blogs Chris' Repository of Knowledge
http://chris123nt.com/2009/03/03/win7-build-7048-ie8-is-removable/#comments
Aeroxperience
http://www.aeroxp.org/2009/03/ie8-functionally-removable/
Now Windows 7 have the control option to turn off Internet Explorer (IE)
Source
http://www.itexaminer.com/windows-7-loosens-ie-8-bundling.aspx