PostgreSQL service won't start after bad computer time

I did some testing involving changing a computer's time, and left the
time one year early (6/3/2010 instead of 2011). The PostgreSQL service
now will not start up. Here's what the log says:

2011-06-03 08:46:50 EDTWARNING: autovacuum not started because of
misconfiguration

2011-06-03 08:46:50 EDTHINT: Enable the "track_counts" option.

2011-06-03 08:46:50 EDTLOG: database system shutdown was interrupted;
last known up at 2011-06-03 08:43:59 EDT

2011-06-03 08:46:50 EDTLOG: database system was not properly shut down;
automatic recovery in progress

2011-06-03 08:46:50 EDTLOG: redo starts at 9/6E08AAB8

2011-06-03 08:46:50 EDTFATAL: the database system is starting up

2011-06-03 08:46:50 EDTFATAL: the database system is starting up

2011-06-03 08:46:51 EDTFATAL: the database system is starting up

2011-06-03 08:46:52 EDTFATAL: the database system is starting up

2011-06-03 08:46:53 EDTFATAL: the database system is starting up

2011-06-03 08:46:54 EDTFATAL: the database system is starting up

2011-06-03 08:46:55 EDTFATAL: the database system is starting up

2011-06-03 08:46:55 EDTFATAL: the database system is starting up

2011-06-03 08:46:56 EDTLOG: record with zero length at 9/8E080968

2011-06-03 08:46:56 EDTLOG: redo done at 9/8E07FA78

2011-06-03 08:46:56 EDTLOG: last completed transaction was at log time
2010-06-03 08:11:17.531-04

2011-06-03 08:46:56 EDTFATAL: xlog flush request 18/A2BE3510 is not
satisfied --- flushed only to 9/8E080968

2011-06-03 08:46:56 EDTCONTEXT: writing block 0 of relation
global/1261_vm

2011-06-03 08:46:56 EDTLOG: startup process (PID 4596) exited with exit
code 1

2011-06-03 08:46:56 EDTLOG: aborting startup due to startup process
failure

How do we recover from this?

RobR