DB corrupted ?

Hi all,

I use Postgres 7.0 on a mandrake 8.0 and I am really novice
with Postgres and SQL.

If I try :
select * from cpjo order by joMA, joJNL, joFOL ;
I obtain :

ERROR:  cannot open segment 1 of relation cpjo
 (target block 1346502656): No such file or directory

but the same request on an other table works well and if if try :
select * from cpjo where joma='200201' order by joMA, joJNL, joFOL ;
                             ================
this works fine also !
joma, jojnl and jofol are the primary key of cpjo and there is nothing
before '200201' in it.

It seem to me that the DB is corrupted
but what I must do for repairs it ?
VACUUM, REINDEX ?

Thanks,
--
Alain Lucari    Eurlix
1, rue Reine Elisabeth von Witellsbach
       (Reine des Belges)
13001 Marseille
FRANCE