Installing SQL Server 2005 fails

I have been trying to install Visual Web Developer 2005 Express Edition and SQL Server 2005. The Web Developer installs ok but the SQL Server installation fails. I can't figure out why. I have (I think...) uninstalled my previous beta intallations. The must be something else that prevents the installation. Can anyone point me to some FAQ or something that can give me some ideas on how to handle the installation.
/andersI would first try a fresh install with no other SQL Sever productsinstalled. Also log the installation and post the log file.
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summary.txt looks like this:
Microsoft SQL Server 2005 9.00.1399.06
==============================
OS Version : Microsoft Windows XP Professional Service Pack 2 (Build 2600)
Time : Fri Nov 25 22:42:40 2005

P2 : The current system does not meet recommended hardware requirements for this SQL Server release. For detailed hardware requirements, see the readme file or SQL Server Books Online.
Machine : P2
Product : Microsoft SQL Server Setup Support Files (English)
Product Version : 9.00.1399.06
Install : Successful
Log File : C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0011_P2_SQLSupport_1.log
------------------------
Machine : P2
Product : Microsoft SQL Server Native Client
Product Version : 9.00.1399.06
Install : Successful
Log File : C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0011_P2_SQLNCLI_1.log
------------------------
Machine : P2
Product : Microsoft SQL Server VSS Writer
Product Version : 9.00.1399.06
Install : Successful
Log File : C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0011_P2_SqlWriter_1.log
------------------------
Machine : P2
Product : MSXML 6.0 Parser
Product Version : 6.00.3883.8
Install : Successful
Log File : C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0011_P2_MSXML6_1.log
------------------------
Machine : P2
Product : Microsoft SQL Server Setup Support Files (English)
Product Version : 9.00.1399.06
Install : Successful
Log File : C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0011_P2_SQLSupport_2.log
------------------------
Machine : P2
Product : Microsoft SQL Server Native Client
Product Version : 9.00.1399.06
Install : Successful
Log File : C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0011_P2_SQLNCLI_2.log
------------------------
Machine : P2
Product : MSXML 6.0 Parser
Product Version : 6.00.3883.8
Install : Successful
Log File : C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0011_P2_MSXML6_2.log
------------------------
Machine : P2
Product : SQL Server Database Services
Error : An instance with the same name is already installed on this computer. To proceed with SQL Server Setup, provide a unique instance name.
------------------------
Machine : P2
Product : SQL Server Database Services
Error : An instance with the same name is already installed on this computer. To proceed with SQL Server Setup, provide a unique instance name.
------------------------
Machine : P2
Product : Microsoft SQL Server 2005 Express Edition
Product Version : 9.00.1399.06
Install : Failed
Log File : C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0011_P2_SQL.log
Last Action : DetectInstanceClash
Error String : An instance with the same name is already installed on this computer. To proceed with SQL Server Setup, provide a unique instance name.
Error Number : 28086
------------------------
Machine : P2
Product : Microsoft SQL Server 2005 Tools Express Edition
Product Version : 9.00.1399.06
Install : Successful
Log File : C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0011_P2_Tools.log
------------------------

SQL Server Setup failed. For more information, review the Setup log file in %ProgramFiles%\Microsoft SQL Server\90\Setup Bootstrap\LOG\Summary.txt.

Time : Fri Nov 25 22:47:40 2005

List of log files:
C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0011_P2_Core(Local).log
C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0011_P2_SQLSupport_1.log
C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0011_P2_SQLNCLI_1.log
C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0011_P2_SqlWriter_1.log
C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0011_P2_MSXML6_1.log
C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0011_P2_SQLSupport_2.log
C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0011_P2_SQLNCLI_2.log
C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0011_P2_MSXML6_2.log
C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0011_P2_SQL.log
C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0011_P2_Tools.log
C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0011_P2_Datastore.xml
C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0011_P2_.NET Framework 2.0.log
C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0011_P2_Support.log
C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0011_P2_Core.log
C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Summary.txt
C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0011_P2_SCC.log

This is "SQLSetup0011_P2-Core.log":
Microsoft SQL Server 2005 Setup beginning at Fri Nov 25 22:41:49 2005
Process ID : 3500
f:\22644329947aca3bcc8446\setup.exe Version: 2005.90.1399.0
Running: LoadResourcesAction at: 2005/10/25 22:41:49
Complete: LoadResourcesAction at: 2005/10/25 22:41:49, returned true
...
And then a number of actions that end with "returned true"
...
Running: DetectLocalBootstrapAction at: 2005/10/25 22:42:37
Complete: DetectLocalBootstrapAction at: 2005/10/25 22:42:37, returned true
Running: LaunchLocalBootstrapAction at: 2005/10/25 22:42:37
Error: Action "LaunchLocalBootstrapAction" threw an exception during execution. Error information reported during run:
"C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\setup.exe" finished and returned: 28086
Aborting queue processing as nested installer has completed
Message pump returning: 28086

Something goes wrong, but I'm not able to analyse what.
"SQLSetup0011_P2_Core(Local).log" looks like this:
Microsoft SQL Server 2005 Setup beginning at Fri Nov 25 22:42:40 2005
Process ID : 1424
C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\setup.exe Version: 2005.90.1399.0
Running: LoadResourcesAction at: 2005/10/25 22:42:40
Complete: LoadResourcesAction at: 2005/10/25 22:42:40, returned true
...
Then there is a number of actions that end with various errors.
...
One or more packages failed to install. Refer to logs for error details. : 28086
Error Code: 0x80076db6 (28086)
Windows Error Text: Source File Name: sqlchaining\sqlchainingactions.cpp
Compiler Timestamp: Thu Sep 1 22:23:05 2005
Function Name: sqls::ReportChainingResults::perform
Source Line Number: 3097

-- Context ---------------
sqls::HostSetupPackageInstallerSynch::postCommit
sqls::HighlyAvailablePackage::preInstall
led due to cancel code received from cancel source: 29539

Error: Failed to add file :"C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Files\SQLSetup0011_P2_.NET Framework 2.0.log" to cab file : "C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\SqlSetup0011.cab" Error Code : 2
Delay load of action "UploadDrWatsonLogAction" returned nothing. No action will occur as a result.
Message pump returning: 28086

/anders