SQL Server Setup Unexpectedly Failed

While trying to download SQL Server 2005 Express SP2 I receive the following error message: 'SQL server Setup Unexpectedly dailed. For more information review the Setup memory log file in %Program Files%Microsoft SQL Server90Setup BootstrapLOGSummary.txt'.

That log file simply contains the text:

Microsoft SQL Server 2005 9.00.3042.00
==============================
OS Version : Microsoft Windows XP Professional Service Pack 2 (Build 2600)

In the Files folder under log, a text file has been created with the following data:



Microsoft SQL Server 2005 Setup beginning at Mon Nov 19 20:30:29 2007
Process ID : 4648
c:fc359db69b5e5a0ff927be3c2esetup.exe Version: 2005.90.3042.0
Running: LoadResourcesAction at: 2007/10/19 20:30:28
Complete: LoadResourcesAction at: 2007/10/19 20:30:28, returned true
Running: ParseBootstrapOptionsAction at: 2007/10/19 20:30:28
Loaded DLL:c:fc359db69b5e5a0ff927be3c2exmlrw.dll Version:2.0.3609.0
Complete: ParseBootstrapOptionsAction at: 2007/10/19 20:30:29, returned false
Error: Action "ParseBootstrapOptionsAction" failed during execution. Error information reported during run:
Could not parse command line due to datastore exception.
Source File Name: utillibpersisthelpers.cpp
Compiler Timestamp: Wed Jun 14 16:30:14 2006
Function Name: writeEncryptedString
Source Line Number: 124
----------------------------------------------------------
writeEncryptedString() failed
Source File Name: utillibpersisthelpers.cpp
Compiler Timestamp: Wed Jun 14 16:30:14 2006
Function Name: writeEncryptedString
Source Line Number: 123
----------------------------------------------------------
Error Code: -2146893813
Windows Error Text: Key not valid for use in specified state.

Source File Name: cryptohelpercryptsameusersamemachine.cpp
Compiler Timestamp: Wed Jun 14 16:28:04 2006
Function Name: sqls::CryptSameUserSameMachine:rotectData
Source Line Number: 50

2148073483
Could not skip Component update due to datastore exception.
Source File Name: datastorecachedpropertycollection.cpp
Compiler Timestamp: Wed Jun 14 16:27:59 2006
Function Name: CachedPropertyCollection::findProperty
Source Line Number: 130
----------------------------------------------------------
Failed to find property "InstallMediaPath" {"SetupBootstrapOptionsScope", "", "4648"} in cache
Source File Name: datastorepropertycollection.cpp
Compiler Timestamp: Wed Jun 14 16:28:01 2006
Function Name: SetupBootstrapOptionsScope.InstallMediaPath
Source Line Number: 44
----------------------------------------------------------
No collector registered for scope: "SetupBootstrapOptionsScope"
Running: ValidateWinNTAction at: 2007/10/19 20:30:29
Complete: ValidateWinNTAction at: 2007/10/19 20:30:29, returned true
Running: ValidateMinOSAction at: 2007/10/19 20:30:29
Complete: ValidateMinOSAction at: 2007/10/19 20:30:29, returned true
Running: PerformSCCAction at: 2007/10/19 20:30:29
Complete: PerformSCCAction at: 2007/10/19 20:30:29, returned true
Running: ActivateLoggingAction at: 2007/10/19 20:30:29
Error: Action "ActivateLoggingAction" threw an exception during execution. Error information reported during run:
Datastore exception while trying to write logging properties.
Source File Name: datastorecachedpropertycollection.cpp
Compiler Timestamp: Wed Jun 14 16:27:59 2006
Function Name: CachedPropertyCollection::findProperty
Source Line Number: 130
----------------------------------------------------------
Failed to find property "primaryLogFiles" {"SetupStateScope", "", ""} in cache
Source File Name: datastorepropertycollection.cpp
Compiler Timestamp: Wed Jun 14 16:28:01 2006
Function Name: SetupStateScope.primaryLogFiles
Source Line Number: 44
----------------------------------------------------------
No collector registered for scope: "SetupStateScope"
00DFCFC0Unable to proceed with setup, there was a command line parsing error. : 2
Error Code: 0x80070002 (2)
Windows Error Text: The system cannot find the file specified.

Source File Name: datastorepropertycollection.cpp
Compiler Timestamp: Wed Jun 14 16:28:01 2006
Function Name: SetupBootstrapOptionsScope.InstallMediaPath
Source Line Number: 44

Class not registered.


Can anyone give me some advice on what I need to correct in order to be able to install SQl server Express? Thanks very much in advance.