Try
Code:
yum clean all
yum update
If that doesn't work try
Code:
yum clean all
rm -f /var/lib/rpm/__db*
rpm --rebuilddb
yum update
Since you already asked this question in another thread, 3 or 4 minutes ago, I need to mention that help here is strictly voluntary. If someone knows the answer and wants to help they might help you out but you really need to have some patience. A critical issue for you is not a critical issue for anyone else.
Searching the forum would have yielded several threads that would have likely given you an answer.