BUG #2765: BUG #2419: could not reattach to shared memory

The following bug has been logged online:

Bug reference: 2765
Logged by: Sergio Medeiros Santi
Email address: trabin(at)trabin(dot)com(dot)br
PostgreSQL version: 8.1.X
Operating system: Windows 2000 Server
Description: BUG #2419: could not reattach to shared memory
Details:

I have this problem since 3 weeks ago. In my case when the server startup PG
starts but don't accepts any connections. If I stop and start de PG the
problem stops e I work nomally until shutdown the server. The environment is
the folowing:

W2K, PG 8.1.2, Avast antivirus.

I try upgrade to PG 8.1.4 using the upgrade.bat. When the upgrade process
finished and after the restart the problem occurs.
I try backup my database and uninstall PG 8.1.2 and delete PG tree, then I
install PG 8.1.4 and restore the backuped database. Well ... after the
restart the problem occurs too.

Can you help me with any suggestion?

Thanks in advance,

Sergio Medeiros Santi
Trabin Software & Consulting
+55 053 3227 4157 - 053 9982 9009