PITR for postgresql-7.3

Hi,

We are running postgresql-7.3.3 and we had a hardware controller and
disk failure on the system.  And of course the database does not appear
to be backup anywhere.

I was reading about PITR and was wondering if that is applicable to my
version.  We do have pg_xlog files and I am wondering if there is anyway
to recover the data.

The error we get when trying to access a very important table is

"Invalid page header in block 51 of vuser"

Any help would be appreciated.
(upgrades and backups lessons learned)

--
Thanks
Mary Ellen