FATAL: could not reattach to shared memory (key=412, addr=03C00000): 487

Hello,

my log files contains the following error message:
...
2008-09-09 11:03:36 CEST LOG: loaded library
"$libdir/plugins/plugin_debugger.dll"
2008-09-09 11:03:38 CEST LOG: loaded library
"$libdir/plugins/plugin_debugger.dll"
2008-09-09 11:03:38 CEST LOG: loaded library
"$libdir/plugins/plugin_debugger.dll"
FATAL: could not reattach to shared memory (key=412, addr=03C00000): 487

I have seen the other bug report mention this error, but none of the
advises (remove antiVirus software, delete postgesql.pid in data folder
[i done even have a postgesql.pid file ...] , use "sfc /scannow") worked
for me.
The error occures not allways, only in 50% of the cases.

PostgresQL Version: 8.3.3
OS: Windows Vista
Python version: Python 2.5.2
psycopg2 version: 2.0.7

The error occured when I connect to my DB wiht Python via. psycopg2.
I would be grateful for any help .

Daniel||