I ran into the same problem years ago when I was starting out. My suggestions go along with what others have said..
1.) check your configuration to assure proper setup.
2.) disable all the extra BS that is running if it is not needed while you are testing (yahoo, etc are resource hogs)
3.) Port conflict - That might be a problem, but if you're looking at files on the same machine via a web browser the port shouldn't matter as the browser is looking inside the network.