CentOS - Sep 2007 - Updating RPMS on system [fails]

I had a problem
when I start my PC
the system start to starts services and check itselfs
but when it arrives to Updating RPMS on system always fails
I want to know why?



-- 
?Nuestra recompensa se encuentra en el esfuerzo y no en el resultado.
Un esfuerzo total es una victoria completa?.
				Mahatma Gandhi