BUG #9270: configuration error

The following bug has been logged on the website:

Bug reference:      9270
Logged by:          saravanan
Email address:      saravananchow@yahoo.com
PostgreSQL version: 9.1.1
Operating system:   Windows 7
Description:

In my test machine i've 4gb ram. If i tried to increase the shared buffer 1
to 2gb and restart the services, but it shown the error like " the
postgresql-9.1 - postgresql server 9.1 service on local computer started and
then stopped.some service stop automatically if they are not in use by other
services or programs  ".
thanks for reply