404 Page Not Found - HELP!!!

[eluser]iblood[/eluser]
yes I already checked it and they nothings missing as of when I installed it..The mystery that I want to solve now is that, how it worked on the first day I installed it and added a test page.. but on the next day it got the error..please check this page http://www.iblood.0fees.net/index.php, the links are working fine but it got the error at the bottom.. and also it won't work on my localhost.. :-(