[CentOS] Yum

This may be considered a newbie question, and for me, yum is a new 
tool.  I have discovered via yum, I am *supposed* to have libf2c (386) 
and libf2c (x86-64) installed.  Searching the two libs, I find I only 
have the 32-bit version installed, and I need both.  Should I use yum to 
remove the pkgs, and then reinstall, or should I use rpm to do the 
installs?  Again, I'm from the BSD camp, so this is all new to me.  
Also, are the two libs in question on the distro CD's or do I need to go 
out and find them, or let yum find them for me and install?

Thanks..

-- 
Snowman