background writer process (PID 1400) exited with exit code 0 -- repeatedly && incomplete startup packet

PG_VERSION 8.1 - windows XP - 1GB RAM -- Desktop workstation, PG used
for test/dev.

This installation has been working fine for quite a while. I've used it
minimally.

I rebooted yestderday- log file from reboot
2006-05-18 12:24:32 LOG: database system was shut down at 2006-05-18
12:23:08 Eastern Daylight Time
2006-05-18 12:24:32 LOG: checkpoint record is at 0/BD0966B0
2006-05-18 12:24:32 LOG: redo record is at 0/BD0966B0; undo record is
at 0/0; shutdown TRUE
2006-05-18 12:24:32 LOG: next transaction ID: 386246; next OID: 37710
2006-05-18 12:24:32 LOG: next MultiXactId: 1; next MultiXactOffset: 0
2006-05-18 12:24:32 LOG: database system is ready
2006-05-18 12:24:32 LOG: transaction ID wrap limit is 2147484148,
limited by database "postgres"

Today I am unable to connect to the DB. Log file is filled with:
2006-05-19 09:24:09 LOG: background writer process (PID 1400) exited
with exit code 0
2006-05-19 09:24:09 LOG: terminating any other active server processes
2006-05-19 09:24:09 LOG: all server processes terminated; reinitializing
2006-05-19 09:24:11 LOG: background writer process (PID 3012) exited
with exit code 0
2006-05-19 09:24:11 LOG: terminating any other active server processes
2006-05-19 09:24:11 LOG: all server processes terminated; reinitializing
2006-05-19 09:24:13 LOG: background writer process (PID 3076) exited
with exit code 0
2006-05-19 09:24:13 LOG: terminating any other active server processes
2006-05-19 09:24:13 LOG: all server processes terminated; reinitializing
2006-05-19 09:24:15 LOG: background writer process (PID 4756) exited
with exit code 0
2006-05-19 09:24:15 LOG: terminating any other active server processes
2006-05-19 09:24:15 LOG: all server processes terminated; reinitializing
2006-05-19 09:24:17 LOG: background writer process (PID 5644) exited
with exit code 0
2006-05-19 09:24:17 LOG: terminating any other active server processes
2006-05-19 09:24:17 LOG: all server processes terminated; reinitializing

I rebooted my system. Logfile now shows a different error. This error
is generated when attempting to connect via either psql or PGAdminIII.

2006-05-19 09:42:26 LOG: database system was shut down at 2006-05-19
09:17:34 Eastern Daylight Time
2006-05-19 09:42:26 LOG: checkpoint record is at 0/BD0966F8
2006-05-19 09:42:26 LOG: redo record is at 0/BD0966F8; undo record is
at 0/0; shutdown TRUE
2006-05-19 09:42:26 LOG: next transaction ID: 386246; next OID: 37710
2006-05-19 09:42:26 LOG: next MultiXactId: 1; next MultiXactOffset: 0
2006-05-19 09:42:26 LOG: database system is ready
2006-05-19 09:42:26 LOG: transaction ID wrap limit is 2147484148,
limited by database "postgres"
2006-05-19 09:49:38 LOG: could not receive data from client: No
connection could be made because the target machine actively refused it.

2006-05-19 09:49:38 LOG: incomplete startup packet
2006-05-19 09:50:54 LOG: could not receive data from client: No
connection could be made because the target machine actively refused it.

2006-05-19 09:50:54 LOG: incomplete startup packet
2006-05-19 09:51:29 LOG: could not receive data from client: No
connection could be made because the target machine actively refused it.

2006-05-19 09:51:29 LOG: incomplete startup packet
2006-05-19 09:56:22 LOG: could not receive data from client: No
connection could be made because the target machine actively refused it.

2006-05-19 09:56:22 LOG: incomplete startup packet

MS firewall is OFF.
Un-installing and re-installing is fine. But if there's anything that I
can provide prior to that for debugging, etc, I am willing to do so. (
If i can 'fix' it w/o re-installing it would be nice too ).