[CentOS] Upgrading from Centos 6.2 64 bit to Centos 6.3 64 bit

Fri Nov 30 03:27:57 UTC 2012
centos wiki <centoswiki at gmail.com>

Hello:
I am new to Centos.  I installed Centos 6.2 64 bit and want to upgrade to
centos 6.3 64 bit without losing my current settings.

Any help?