DB corruption

Hi,
I have a query on DB corruption. Is there any way to recover from it
without losing data ?

Starting postgresql service: [ OK ]
psql: FATAL: index "pg_authid_rolname_index" contains unexpected zero page
at block 0
HINT: Please REINDEX it.
psql: FATAL: "base/11564" is not a valid data directory
DETAIL: File "base/11564/PG_VERSION" does not contain valid data.
HINT: You might need to initdb.
psql: FATAL: "base/11564" is not a valid data directory
DETAIL: File "base/11564/PG_VERSION" does not contain valid data.
HINT: You might need to initdb.
psql: FATAL: "base/11564" is not a valid data directory
DETAIL: File "base/11564/PG_VERSION" does not contain valid data.
HINT: You might need to initdb.
psql: FATAL: "base/11564" is not a valid data directory
DETAIL: File "base/11564/PG_VERSION" does not contain valid data.
HINT: You might need to initdb.

With Best Regards
Akshay

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