firefox link should be : getfirefox.com (try firefox.com) or mozilla.org
problem with internet explorer can be many...
1)is it old version? (they ARE slow)
2) Have u go firewall/proxy that migth slow down exploring?
3) is same thing happening with diffrent browsers?
4) when did u last checked computer for viruses?
5) when did u last did disckdefragnament and other stuff... (dunno if that helps but should make least comp faster
6) do u have any user accounts? may settings of user accounts make it slower? (no idea)
suggesion: get firefox or reinstall windows/IE
or get linux