SQL Server Setup could not connect to the database service for server configuration

OS: XP-SP2

Not able to install SQL Express 2005.
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SQL Server Setup could not connect to the database service for server configuration. The error was: [Microsoft][SQL Native Client]SSL Provider: The certificate chain was issued by an authority that is not trusted.
 Refer to server error logs and setup logs for more information. For details on how to view setup logs, see "How to View Setup Log Files" in SQL Server Books Online.

For help, click: http://go.microsoft.com/fwlink?LinkID=20476&ProdName=Microsoft+SQL+Server&ProdVer=9.00.1399.06&EvtSrc=setup.rll&EvtID=29515&EvtType=lib%5codbc_connection.cpp%40Do_sqlScript%40OdbcConnection%3a%3aconnect%40connect%40x80090325

Needles to say, above link is useless..

I had managed to install previously, but ran into problems while trying to upsize an MS-Access database, I've tried everything from creating certificate to hacking away at the registry...Log-on with a different account, etc...Anybody knows how to get around this?

Here's part of the log file:

Microsoft SQL Server 2005 9.00.1399.06
==============================
OS Version      : Microsoft Windows XP Professional Service Pack 2 (Build 2600)
Time            : Sat Jun 03 20:09:53 2006
 
Machine         : YANICK
Product         : Microsoft SQL Server Setup Support Files (English)
Product Version : 9.00.1399.06
Install         : Successful
Log File        : e:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0005_YANICK_SQLSupport_1.log
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Machine         : YANICK
Product         : Microsoft SQL Server Native Client
Product Version : 9.00.1399.06
Install         : Successful
Log File        : e:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0005_YANICK_SQLNCLI_1.log
--------------------------------------------------------------------------------
Machine         : YANICK
Product         : Microsoft SQL Server VSS Writer
Product Version : 9.00.1399.06
Install         : Successful
Log File        : e:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0005_YANICK_SqlWriter_1.log
--------------------------------------------------------------------------------
Machine         : YANICK
Product         : MSXML 6.0 Parser
Product Version : 6.00.3883.8
Install         : Successful
Log File        : e:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0005_YANICK_MSXML6_1.log
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Machine         : YANICK
Product         : SQL Server Database Services
Error           : SQL Server Setup could not connect to the database service for server configuration. The error was: [Microsoft][SQL Native Client]SSL Provider: The certificate chain was issued by an authority that is not trusted.
 Refer to server error logs and setup logs for more information. For details on how to view setup logs, see "How to View Setup Log Files" in SQL Server Books Online.
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Machine         : YANICK
Product         : Microsoft SQL Server 2005 Express Edition
Product Version : 9.00.1399.06
Install         : Failed
Log File        : e:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0005_YANICK_SQL.log
Last Action     : InstallFinalize
Error String    : SQL Server Setup could not connect to the database service for server configuration. The error was: {Microsoft}{SQL Native Client}SSL Provider: The certificate chain was issued by an authority that is not trusted.
Error Number    : 29515
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