Thank you! I've copied the file using USB drive and now the server is up and running. I also did yum reinstall zlib.
Now when I do yum update, it says: No Packages marked for Update
If that's the case, how come /etc/redhat-release still shows CentOS release 5.5 (Final) ?
Asya
I figured it out. Whoever was in charge of this server before me, added the following lines to CentOS-Base.repo
exclude=kernel kernel-devel kernel-PAE-*
Thank you all for your help!
Asya