Getting ntfs read write permissions working on RHEL or CentOS can be tricky the tricky part is that the ntfs drivers don't explicitly require (in the package) dkms and dkms-fuse but they don't work without it so you can happily install the ntfs stuff but not be able to load the kernel drivers.
Here's a great step by step page that talks about it and tells you to install dkms & dkms-fuse
http://wiki.centos.org/TipsAndTricks/NTFSPartitions or you can just add
yum install dkms dkms-fuse
to whatever NTFS instructions you are following.
