Probelm installing RPMs

[Tim Bradshaw <dragon8856 cox net>]

I am running Fedora Core 2. Before now it has allowed installation via 
Install Packages without problem. Now I get an error message "Unable to 
read package. Be sure you have proper permissions to use this file." I 
checked the permissions and they are completely allowed, 
read-write-execute etc., and it shows my non-root user account as the 
owner. I tried to install via root login, but got the same error. Does 
anyone know what I'm doing wrong or have a suggestion as to what I 
shoudl try? Everything else on the system seems to work fine.

Thanks