How to fix two disks with the same Volume Group?

[Chris G]

I have just had Fedora 7 re-installed on my work desktop as the old
disk drive was slowly failing.

I need to access the old disk if I can, it's still in the system and
visible but the person who installed it didn't change volume groups so
I have two disk drives with the same volume group.  How do I change the
name of the old disk's volume group so I can mount it and see it?

Running vgscan returns:-

  Reading all physical volumes.  This may take a while...
  WARNING: Duplicate VG name VolGroup00: Existing
P6sqp0-rIos-JYmi-8L32-ymtN-LzB4-g5BdLL (created here) takes precedence
over TdWFKp-H4tw-UrVq-Jmre-26hv-zmyE-IZXQLI
  Found volume group "VolGroup00" using metadata type lvm2
  Found volume group "VolGroup00" using metadata type lvm2

-- 
Chris Green