I don't know - I thought the keyboard driver might be broken but you can enter a url OK from the leyboard - perhaps your browser has been infected or has become corrupt - use your regular browser and go to address
http://www.mozilla-europe.org/en/firefox/
or
http://www.mozilla.com/en-US/
and download the Firefox (free) browser and use it and see if it works
Good luck...
Peccavi
October 2009