Netbackup 6.5 Installation Fails On RHEL5.1 x64

[Steve_808]

    I am trying to do a fresh install of NB 6.5 on RHEL5.1 and it is failing on the PBX installation with the error:
CPI ERROR V-9-1-1387 Cannot install Symantec Private Branch Exchange on
system 'systemname' as its platform is  and this release supports
Linux.
I looked at the installation script and it issues a uname -s to determine system type, it is looking for Linux and when I type uname -s I get Linux so I am a bit confused.
TIA,
Steve

[CRZ]

Which ICS installer media are you using?  If you're using IA64, it doesn't work on X64; you'll need to use the X86 CD.

If you ARE using the X86 disc, could you cut'n'paste the output of `uname -a` here?

Also, check the hostname returned by that uname against any entries containing this hostname in the /etc/hosts file.