The following bug has been logged online:

Bug reference: 2008
Logged by: Antonio Pedro Lopes
Email address: antonio.pedro (AT) pararede (DOT) com
PostgreSQL version: PostgreSQL 8.0
Operating system: WindowsXP Professional
Description: IUSR (Internet Guest Account) - ADO Connection problems
IUSR missing permissions.
Details:

I have an ASP application that is trying to connect with a Postgres database
using postgresql driver. When the application try to connect the following
error is throw.

ADO Reports these Database Error(s) executing:
DRIVER={PostgreSQL};SERVER=127.0.0.1;PORT=5432;Dat abase=DBNAME;Uid=postuser;
Pwd=xx
Error#=-2147467259
Error description=Specified driver could not be loaded due to system
error 998 (PostgreSQL).

But if given to the IUSR (Internet Guest Account) the Administration Group
permission, all works fine!!

I need to know what kind of permission the IUSR needs to load the Postgres
Driver.

I already give to IUSR full control to the PostgreSQL folders and
subfolders, but the same error occurs.

Any help would be appreciated.

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TIP 2: Don't 'kill -9' the postmaster