No posts or pages displaying on new install!!

Hi there guys! Ive just installed wordpress probably a little to quickly i think! I cannot get any of the functions to work.When i click on a post or the ‘about’ button for example it just says – The page cannot be found. What have i installed wrong..ive been on this for 8 hours now and cant cope!!! Ive uploaded a revolution theme and this show fine just theres nothing other that the main page….Im sure this is simple but cannot find anything on the fourums.Please help!!