Problem installing server instance on windows xp sp2

Hello all (sorry for the cross post, I previously posted that message in getting started)

I have a problem installing a SQL Server 2005 (developper edition) on my windows XP SP2 machine.

When I launch the setup, all the requirements are ok, but I'm just allowed to install client components and documentations. I can't install the database server instance.

The Sql Server is downloaded from MSDN (2 iso files extracted to my HD)

My machine is a P4 2.8Ghz HT with 1Gig of RAM.

Thanks for your help

FYI, here's the Report for the system configuration check:

System Configuration Check

- WMI Service Requirement (Success)

Messages

WMI Service Requirement

Check Passed

- MSXML Requirement (Success)

Messages

MSXML Requirement

Check Passed

- Operating System Minimum Level Requirement (Success)

Messages

Operating System Minimum Level Requirement

Check Passed

- Operating System Service Pack Level Requirement. (Success)

Messages

Operating System Service Pack Level Requirement.

Check Passed

- SQL Server Edition Operating System Compatibility (Success)

Messages

SQL Server Edition Operating System Compatibility

Check Passed

- Minimum Hardware Requirement (Success)

Messages

Minimum Hardware Requirement

Check Passed

- IIS Feature Requirement (Success)

Messages

IIS Feature Requirement

Check Passed

- Pending Reboot Requirement (Success)

Messages

Pending Reboot Requirement

Check Passed

- Performance Monitor Counter Requirement (Success)

Messages

Performance Monitor Counter Requirement

Check Passed

- Default Installation Path Permission Requirement (Success)

Messages

Default Installation Path Permission Requirement

Check Passed

- Internet Explorer Requirement (Success)

Messages

Internet Explorer Requirement

Check Passed

- COM Plus Catalog Requirement (Success)

Messages

COM Plus Catalog Requirement

Check Passed

- ASP.Net Version Registration Requirement (Success)

Messages

ASP.Net Version Registration Requirement

Check Passed

- Minimum MDAC Version Requirement (Success)

Messages

Minimum MDAC Version Requirement

Check Passed

try launching setup from the other ISO.