[CentOS] Help!

    Folks, I have a bit of a problem and can't seem to figure out what 
is getting broken or why.  I've been pulling my hair out trying to get 
clamav or clamav-milter to install and permit yum update to continue.  
What is happening is this:  I yum install the clamav package, but when I 
try to do an update on the system, it constantly returns with an error 
of a Missing Dependency for clamd and clamav-db.  I've installed and 
erased clamav several times, and that's the only way I can do a yum 
update on the system.  The files are coming from sourceforge, and the 
version is 0.93-2.el4rf.  Perhaps I'm not installing in the correct 
sequence or something, so could someone please tell me how to go about 
getting all the dependencies for the clamav package?  This is the x86_64 
version I've been working with.

Many thanks....

Sam