You need to install a kernel-devel package that matches your running kernel. From the output you presented, I see your running kernel is 2.6.32-279.el6. I strongly recommend you update it to... [by toracat]
Installation of the nvidia driver requires that you have a kernel-devel package that matches your running kernel. Your running kernel is a PAE type. When you do a 'yum install ... [by toracat]
In the distro I'm most familiar with -- ALTLinux, a command like apt-get install kernel-image-std-def#3.0....