Norton ghost 2003 HELP

I know this is probably been asked a million times but i need help on this.  I have a gateway gt5012 desktop with 2 sata drives.  I only want to back up the C;/ drive image of it to an USB 2.0 external 1tb hard drive.  I am using Windows media center sp3.  I installed the latest build of ghost which is .793 and i have tried to create the disk but no go.  I need some help here and step by step would be appreciated.