try installing fuse

yum install -y fuse

I got the below message

[root@localhost ~]# yum install -y fuse
Loaded plugins: rhnplugin, security
This system is not registered with RHN.
RHN support will be disabled.
Setting up Install Process
Parsing package install arguments
Package fuse-2.7.4-8_12.el4.x86_64 installed and not available
Nothing to do

do me a favor please - please paste result of

rpm -qa | grep -i ntfs

Need to verify if package indeed is meant for 64 bit RHEL 5


Ooops missed out architechture specific command

rpm -qa --qf "%{n}-%{arch}\n" | grep -i ntfs

[root@localhost ~]# rpm -qa | grep -i ntfs
ntfs-3g-devel-2011.4.12-1.el4.pp
ntfs-3g-2011.4.12-1.el4.pp
ntfs-3g-libs-2011.4.12-1.el4.pp
[root@localhost ~]#



[root@localhost ~]# rpm -qa --qf "%{n}-%{arch}\n" | grep -i ntfs
ntfs-3g-devel-x86_64
ntfs-3g-x86_64
ntfs-3g-libs-x86_64
[root@localhost ~]#


Thank you for all your help

Wow... After being out of the loop for a bit, there seems to be much of nothing going on?

Give me the results of the following:

[root@localhost ~]# uname -a
Linux localhost.localdomain 2.6.18-128.el5 #1 SMP Wed Dec 17 11:41:38 EST 2008 x86_64 x86_64 x86_64 GNU/Linux
[root@localhost ~]#

[root@localhost ~]# mount
/dev/mapper/VolGroup01-LogVol00 on / type ext3 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/sda1 on /boot type ext3 (rw)
tmpfs on /dev/shm type tmpfs (rw)
/dev/sdb1 on /NewHD type ext3 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
[root@localhost ~]#


[root@localhost ~]# lsusb
Bus 001 Device 004: ID 0bc2:3000 Seagate RSS LLC
Bus 001 Device 001: ID 0000:0000
Bus 002 Device 001: ID 0000:0000
Bus 002 Device 002: ID 09ae:0002 Tripp Lite
Bus 005 Device 001: ID 0000:0000
Bus 004 Device 001: ID 0000:0000
Bus 003 Device 001: ID 0000:0000
[root@localhost ~]#


Thanks again
KJ

Ok, moving on, now post the output of the following:
This may be too much, but I want a good visual. I'm just helping you out, along with showing you what I am doing so you understand a bit on how to do this manually. And please use code tags!

[root@localhost ~]# tail /var/log/messages
Dec 9 10:52:11 localhost kernel: Buffer I/O error on device sdc, logical block 0
Dec 9 10:52:11 localhost kernel: Buffer I/O error on device sdc, logical block 1
Dec 9 10:52:11 localhost kernel: Buffer I/O error on device sdc, logical block 2
Dec 9 10:52:11 localhost kernel: Buffer I/O error on device sdc, logical block 3
Dec 9 13:32:28 localhost gconfd (rajagopal-4731): starting (version 2.14.0), pid 4731 user 'rajagopal'
Dec 9 13:32:28 localhost gconfd (rajagopal-4731): Resolved address "xml:readonly:/etc/gconf/gconf.xml.mandatory" to a read-only configuration source at position 0
Dec 9 13:32:28 localhost gconfd (rajagopal-4731): Resolved address "xml:readwrite:/home/rajagopal/.gconf" to a writable configuration source at position 1
Dec 9 13:32:28 localhost gconfd (rajagopal-4731): Resolved address "xml:readonly:/etc/gconf/gconf.xml.defaults" to a read-only configuration source at position 2
Dec 9 15:34:58 localhost gconfd (rajagopal-4731): GConf server is not in use, shutting down.
Dec 9 15:34:58 localhost gconfd (rajagopal-4731): Exiting



[root@localhost ~]# ls -al /dev/sd*
brw-r----- 1 root disk 8, 0 Dec 9 07:59 /dev/sda
brw-r----- 1 root disk 8, 1 Dec 9 07:59 /dev/sda1
brw-r----- 1 root disk 8, 2 Dec 9 07:59 /dev/sda2
brw-r----- 1 root disk 8, 16 Dec 9 07:59 /dev/sdb
brw-r----- 1 root disk 8, 17 Dec 9 07:59 /dev/sdb1
brw-r----- 1 root disk 8, 32 Dec 9 10:20 /dev/sdc
brw-r----- 1 root disk 8, 33 Dec 9 10:21 /dev/sdc1
[root@localhost ~]#

Ok, /dev/sdc is your block device; sdc1 is the partition you need to mount. Perform the following:
Now if this isn't allowing you to mount it, then mount it like so:

No luck, I got the below message

[root@localhost ~]# mkdir /mnt/exthd
[root@localhost ~]# mount /dev/sdc1 /mnt/exthd
mount: you must specify the filesystem type
[root@localhost ~]# mount -t ntfs /dev/sdc1 /mnt/exthd
mount: unknown filesystem type 'ntfs'
[root@localhost ~]#

Oops, use ntfs-3g. I know this is repetitive, but there were mixed answers before.

I had forgot to tell you, I used ntfs-3g and it was giving same error. Fuse is missing

could you please run following for me and paste results

[root@localhost ~]# lsmod
Module Size Used by
nls_utf8 35137 0
hfsplus 111817 0
autofs4 57033 2
hidp 83521 2
rfcomm 104809 0
l2cap 89281 10 hidp,rfcomm
bluetooth 118597 5 hidp,rfcomm,l2cap
sunrpc 197897 1
dm_multipath 55257 0
scsi_dh 41665 1 dm_multipath
video 53197 0
hwmon 36553 0
backlight 39873 1 video
sbs 49921 0
i2c_ec 38593 1 sbs
button 40545 0
battery 43849 0
asus_acpi 50917 0
acpi_memhotplug 40133 0
ac 38729 0
ipv6 424609 30
xfrm_nalgo 43333 1 ipv6
crypto_api 42945 1 xfrm_nalgo
lp 47121 0
i2c_i801 41813 0
i2c_core 56129 2 i2c_ec,i2c_i801
parport_pc 62312 1
ide_cd 73825 0
shpchp 70765 0
floppy 95465 0
e1000e 145809 0
usb_storage 116641 0
parport 73165 2 lp,parport_pc
i5000_edac 43465 0
edac_mc 60193 1 i5000_edac
pcspkr 36289 0
serio_raw 40517 0
cdrom 68713 1 ide_cd
sg 69993 0
dm_raid45 99025 0
dm_message 36161 1 dm_raid45
dm_region_hash 46145 1 dm_raid45
dm_mem_cache 38977 1 dm_raid45
dm_snapshot 51465 0
dm_zero 35265 0
dm_mirror 53065 0
dm_log 44865 3 dm_raid45,dm_region_hash,dm_mirror
dm_mod 100369 11 dm_multipath,dm_raid45,dm_snapshot,dm_zero,dm_mirror,dm_log
ata_piix 56901 3
libata 208721 1 ata_piix
sd_mod 56385 5
scsi_mod 196569 5 scsi_dh,usb_storage,sg,libata,sd_mod
ext3 168017 3
jbd 94257 1 ext3
uhci_hcd 57433 0
ohci_hcd 55925 0
ehci_hcd 65741 0
[root@localhost ~]#

Please execute following and try mounting again.
Alternate Source - try rpmfind.net