On 02/05/10 12:57 PM, Sofer, Yuval wrote:

PG "FATAL: could not reattach to shared memory (key=5432001, addr=02100000): Invalid argument.

On windows this kind of issue, generally happens due to Firewall/Antivirus Software.

Please try with disabling the firewall/antivirus software and restart the PostgreSQL.

Following is a thread, which has good discussion on it:
http://www.mail-archive.com/pgsql-general@postgresql.org/msg132613.html

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Thanks & Regards,
Vibhor Kumar.