what's wrong with my ie?

when i open my ie today, its homepage becomes http://easy-search.biz/,

i click on tools->internet options, then reset google as usual homepage, then click apply, ok. but nothing happened, it still shows
http://easy-search.biz/,

then i just type google.com in address bar, it said:
ERROR The requested URL could not be retrieved.

then i click on the google link on that link, google page shows, but in the left bottom, there is a line says: