Installation error

I am trying to install Sentora on ramnode vps but i keep getting error 

Detected : CentOs 6 x86_64
Ok.
DB server will be mySQL
It appears that package httpd is already installed. This installer
is designed to install and configure Sentora on a clean OS installation only) 


Then My host told me to use : you might try removing the httpd pacakge: 


But I again face the issue same even after using above code in putty.
It appears that package bind is already installed. This installer

is designed to install and configure Sentora on a clean OS installation only!

Can you please guide me what to do?