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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