According to Microsoft if you uninstall IE8 there will still be some parts of it left to work with Windows. It will not completely uninstall, so in order to view web pages you will need a third party browser like Mozilla.
See the Microsoft article.
How do I uninstall or remove Internet Explorer 8?
Article ID: 957700 - Last Review: March 19, 2010 - Revision: 9.0 ... Therefore, if you remove Internet Explorer 8, you will have to install a third-party browser to be able to browse the Internet. ... version of Windows that you are running, or if you need help verifying that you are an administrator, click here to ...
support.microsoft.com/kb/957700 - Cached - Similar