query abt yum

[sylvan dacounha]

Dear All
  
i want to install software using Yum like clamav
   
  but when i try to run clamav

   
  ex yum install clamav
   
  its gives me the following message
   
  Setting up Install Process
Setting up repositories
update                    100% |=========================|  951 B    00:00     
base                      100% |=========================| 1.1 kB    00:00     
addons                    100% |=========================|  951 B    00:00     
extras                    100% |=========================| 1.1 kB    00:00     
Reading repository metadata in from local files
Parsing package install arguments
No Match for argument: clamav
Nothing to do
   
   
  how do i download software from the net using yum
   
   
  appreciate your help
   
  thnks and reagrds
   
  simon
   
   
   
   

       
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