I can't tell what you are doing from that. Perhaps you mean your browser is
'branded' in the titlebar of all explorer windws, and perhaps you mean you
are using another browser.
If another browser, you use the start/all programs/"Set Program Access and
Defaults" icon to reset your default to the standard MS products.
If the browser is branded, you would need to change a registry entry to
remove it. How to use Reset Internet Explorer Settings (RIES) :
http://support.microsoft.com/kb/923737/en-us