welcome to webune support forums

if you want to know how you can setup Internet Explorer 8 as your default browser just go to:

Tools > Internet Options

go to the Programs Tab

the first section will say:
Default Web Browser
Internet Explorer is the default web browser.
there you will find a check box that says:
Tell me if Internet Explorer is not the default web browser

you will also see a button that says: make default
28p-2652-make-default-browser.gif

so click on the make default button and click Aplly then OK

thats it