Disaster recovery: pg_class

After a system crash, I have this error:

 SELECT * from mytable;
 WARNING:  could not write block 14 of 1663/1743558/1259
 DETAIL:  Multiple failures --- write error may be permanent.
 ERROR:  xlog flush request 4/D43E0A00 is not satisfied --- flushed only to 4/D42700F0
 CONTEXT:  writing block 14 of relation 1663/1743558/1

I searched for 1259 oid, and I found that 1259 links to pg_class table.
Is there any way to restore my pg_class table?

Thanks in advantage.

Enrico

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