Recover from failed files

A small office customer of ours is in a bit of fix due to a HDD crash on their PGSQL machine.  Their IT support staff on duty left around a week ago, without notice, and apparently, he was not good at keeping backups.

Upon inspecting the hard drive, we were able to salvage the "data" folder, but when we try to load it into the PGSQL version of the data folder (8.2), the server would not load.  Upon closer inspection, we suspect the culprit to be the file 0015 in pg_clog which is 214kb instead of 256kb size of all other files in the same folder.

Is there any way that we can salvage the data from this data folder?

Thank you in advance for your suggestions.

Regards

HASSAN