How to rebuild tables

Hello list,

a few days ago my HD crashed. Unfortunally i have only a copy of the PGDATA-directory, no pg_dump-file. I installed the
samepostgresql-version (6.3.2) on another system (tested it with some test-db/-tables) and then copied the
PGDATA-directoryto that computer, but that wan't work. The postmaster start correct but every frontend-command ends
witherrors (can't find db in pg_database). 

What should i do to recover these databases.
Is there a tool to use the old tables in the new database.
Why doen't work postgresql with these PGDATA-directory ?

Sincerely, kuMichaelis.

-------------------------------
I                             I
I  Kay-Uwe Michaelis          I
I  Am Bachableiter 3          I
I  85464 Neufinsing           I
I  Tel: 08121-974659          I
I  Fax: 08121-989785          I
I  email: kum@kumichaelis.de  I
I                             I
-------------------------------