Help with database recovery ...

My database crashed and server won't start ...

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LOG: database system was interrupted while in recovery at 2011-05-01
19:31:37 CEST
HINT: This probably means that some data is corrupted and you will have
to use the last backup for recovery.
LOG: checkpoint record is at 2/D41C1350
LOG: redo record is at 2/D41C1350; undo record is at 0/0; shutdown
FALSE
LOG: next transaction ID: 752151177; next OID: 50716
LOG: next MultiXactId: 1; next MultiXactOffset: 0
LOG: database system was not properly shut down; automatic recovery in
progress
LOG: redo starts at 2/D41C1394
PANIC: could not access status of transaction 752150401
DETAIL: could not read from file "pg_clog/02CD" at offset 73728:
Success
LOG: startup process (PID 3504) was terminated by signal 6
LOG: aborting startup due to startup process failure
LOG: logger shutting down
---------------------------------------------------------------
What can I do ?

[root(at)pg_log]# postgres --version
postgres (PostgreSQL) 8.1.18

OS is Centos.

Any hint ?