repeatedly process termination in PG 8.2

Hi there,

one  of our systems on a PG 8.2 database crashes nearly daily; others are running fine. Host OS of this system is
Windows,if the db crashes nothing is written in the OS event logs. The database log show every time the following
messages:
    2009-09-23 10:21:30 LOG:  server process (PID 1240) exited with exit code -1073741819
    2009-09-23 10:21:30 LOG:  terminating any other active server processes
    2009-09-23 10:21:30 WARNING:  terminating connection because of crash of another server process
    2009-09-23 10:21:30 DETAIL:  The postmaster has commanded this server process to roll back the     current
transactionand exit, because another server process exited abnormally and possibly corrupted     shared memory. 
    2009-09-23 10:21:30 HINT:  In a moment you should be able to reconnect to the database and repeat     your command.
    2009-09-23 10:21:30 WARNING:  terminating connection because of crash of another server process
    2009-09-23 10:21:30 DETAIL:  The postmaster has commanded this server process to roll back the     current
transactionand exit, because another server process exited abnormally and possibly corrupted     shared memory. 
    2009-09-23 10:21:30 HINT:  In a moment you should be able to reconnect to the database and repeat     your command.
    2009-09-23 10:21:30 WARNING:  terminating connection because of crash of another server process
    2009-09-23 10:21:30 DETAIL:  The postmaster has commanded this server process to roll back the     current
transactionand exit, because another server process exited abnormally and possibly corrupted     shared memory. 
    2009-09-23 10:21:30 HINT:  In a moment you should be able to reconnect to the database and repeat     your command.
    2009-09-23 10:21:30 WARNING:  terminating connection because of crash of another server process
    2009-09-23 10:21:30 DETAIL:  The postmaster has commanded this server process to roll back the     current
transactionand exit, because another server process exited abnormally and possibly corrupted     shared memory. 
    2009-09-23 10:21:30 HINT:  In a moment you should be able to reconnect to the database and repeat     your command.
    2009-09-23 10:21:30 WARNING:  terminating connection because of crash of another server process
    2009-09-23 10:21:30 DETAIL:  The postmaster has commanded this server process to roll back the     current
transactionand exit, because another server process exited abnormally and possibly corrupted     shared memory. 
    2009-09-23 10:21:30 HINT:  In a moment you should be able to reconnect to the database and repeat     your command.
    2009-09-23 10:21:30 WARNING:  terminating connection because of crash of another server process
    2009-09-23 10:21:30 DETAIL:  The postmaster has commanded this server process to roll back the     current
transactionand exit, because another server process exited abnormally and possibly corrupted     shared memory. 
    2009-09-23 10:21:30 HINT:  In a moment you should be able to reconnect to the database and repeat     your command.
    2009-09-23 10:21:30 WARNING:  terminating connection because of crash of another server process
    2009-09-23 10:21:30 DETAIL:  The postmaster has commanded this server process to roll back the     current
transactionand exit, because another server process exited abnormally and possibly corrupted     shared memory. 
    2009-09-23 10:21:30 HINT:  In a moment you should be able to reconnect to the database and repeat     your command.
    2009-09-23 10:21:32 LOG:  all server processes terminated; reinitializing
The exit code in the first log line is the same on every crash even. But I could not find anything about it on the net.
Otherapplications on the same system doesn´t show notes that reference to hardware based causes. May anyone give me a
hintwhat´s wrong with this system or what we can do to avoid further crashes?  

Regards

Michael

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