frmConnect.cmd Connect_Click: 429 - Class not registered

When attempting to connect to the database I receive this error message:

==================================================
| An error has occurred in pgAdmin II:frmConnect.cmdConnect_Click: |
|
|
| Number: 429
|
| Description: Class not registered
|
==================================================

The database is PostgreSQL version 7.1.3 running on RH 7.2.

The is the relevant output from the windows debug.log

=================================================================
2003-01-03 09:13:26 - Entering pgAdmin II:frmConnect.Load_Defaults(0)
2003-01-03 09:13:26 - Entering pgAdmin II:basRegistry.RegRead(-2147483647,
"Software\pgAdmin II\Connections", "Connection 1")
2003-01-03 09:13:39 - Entering pgAdmin II:frmConnect.cmd Connect_Click()
2003-01-03 09:13:39 - Connecting to pbz50.pbzinc.loc...
2003-01-03 09:13:39 - Entering pgAdmin II:basRegistry.RegRead(-2147483647,
"Software\pgAdmin II", "Master DB")
2003-01-03 09:13:39 - Entering pgSchema:pgServer.Property Let
MasterDB("template1")
2003-01-03 09:13:40 - Entering pgSchema:pgServer.Connect("pbz50.pbzinc.loc",
5432, "postgres", "********")
2003-01-03 09:13:40 - Opening cnPostgreSQL:
SERVER=pbz50.pbzinc.loc;PORT=5432;UID=postgres;PWD=********;DATABASE=templat
e1;DRIVER={PostgreSQL};READONLY=0;PROTOCOL=6.4;FAKEOIDINDEX=0;SHOWOIDCOLUMN=
0;ROWVERSIONING=0;SHOWSYSTEMTABLES=0;CONNSETTINGS=;FETCH=100;SOCKET=4096;UNK
NOWNSIZES=0;MAXVARCHARSIZE=254;MAXLONGVARCHARSIZE=65536;OPTIMIZER=1;KSQO=1;U
SEDECLAREFETCH=0;TEXTASLONGVARCHAR=1;UNKNOWNSASLONGVARCHAR=1;BOOLSASCHAR=1;P
ARSE=0;CANCELASFREESTMT=0;EXTRASYSTABLEPREFIXES=dd_;COMMLOG=1;DEBUG=1;
2003-01-03 09:13:41 - Entering pgSchema:pgServer.ExecSQL("SELECT version()",
"Connection: Provider=MSDASQL.1;Extended Properties="DRIVER={PostgreSQL};DAT
ABASE=template1;SERVER=pbz50.pbzinc.loc;PORT=5432;UID=postgres;PWD=;ReadOnly
=0;Protocol=6.4;FakeOidIndex=0;ShowOidColumn=0;RowVersioning=0;ShowSystemTab
les=0;ConnSettings=;Fetch=100;Socket=4096;UnknownSizes=0;MaxVarcharSize=254;
MaxLongVarcharSize=65536;Debug=1;CommLog=1;Optimizer=1;Ksqo=1;UseDeclareFetc
h=0;TextAsLongVarchar=1;UnknownsAsLongVarchar=1;BoolsAsChar=1;Parse=0;Cancel
AsFreeStmt=0;ExtraSysTablePrefixes=dd_;LFConversion=1;UpdatableCursors=1;Dis
allowPremature=0;TrueIsMinus1=0;BI=0"", 0, -1, 1)
2003-01-03 09:13:41 - SQL (template1): SELECT version()
2003-01-03 09:13:42 - Done - 2.18 Secs.

2003-01-03 09:13:42 -
*******************************************************************
2003-01-03 09:13:42 - Error(s)
2003-01-03 09:13:42 -
*******************************************************************
2003-01-03 09:13:42 - Error in pgAdmin II:frmConnect.cmd Connect_Click:
429 - Class not registered
2003-01-03 09:13:42 - The following error(s) have been logged:

-2147221164 - Class not registered

2003-01-03 09:13:42 - Windows Version: Windows ME v4.90 build 3000
2003-01-03 09:13:42 - pgSchema Version: 1.4.12
2003-01-03 09:13:42 - MDAC Version: 2.6
2003-01-03 09:13:42 - DBMS Version: 07.02.0005 PostgreSQL 7.1.3 on
i686-pc-linux-gnu, compiled by GCC 2.96
2003-01-03 09:13:42 - Connection String (Master Connection):
Provider=MSDASQL.1;Extended
Properties="DRIVER={PostgreSQL};DATABASE=template1;SERVER=pbz50.pbzinc.loc;P
ORT=5432;UID=postgres;PWD=********;ReadOnly=0;Protocol=6.4;FakeOidIndex=0;Sh
owOidColumn=0;RowVersioning=0;ShowSystemTables=0;ConnSettings=;Fetch=100;Soc
ket=4096;UnknownSizes=0;MaxVarcharSize=254;MaxLongVarcharSize=65536;Debug=1;
CommLog=1;Optimizer=1;Ksqo=1;UseDeclareFetch=0;TextAsLongVarchar=1;UnknownsA
sLongVarchar=1;BoolsAsChar=1;Parse=0;CancelAsFreeStmt=0;ExtraSysTablePrefixe
s=dd_;LFConversion=1;UpdatableCursors=1;DisallowPremature=0;TrueIsMinus1=0;B
I=0"