I'm attempting to install SQL Server 2005 Developer edition on Windows XP
Media Center SP2.

I get the error:
An installation package for the product Microsoft SQL Server VSS writer
cannot be found. Try the installation again using a valid copy of the
installation package "sqlwriter.msi"

On the CD, sqlwriter.msi is present in the Setup folder.
This is the sqlwriter section of the log:
MSI (s) (B4:B4) [11:11:55:578]: Running Script:
C:\WINDOWS\Installer\MSI20B.tmp
MSI (s) (B4:B4) [11:11:55:578]: PROPERTY CHANGE: Adding UpdateStarted
property. Its value is '1'.
MSI (s) (B4:B4) [11:11:55:578]: Machine policy value 'DisableRollback' is 0
MSI (s) (B4:B4) [11:11:55:578]: Note: 1: 1402 2:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\Curr entVersion\Installer\Rollback\Scripts 3: 2
MSI (s) (B4:B4) [11:11:55:593]: Executing op:
Header(Signature=1397708873,Version=301,Timestamp= 895310204,LangId=1033,Platform=0,ScriptType=1,Scri ptMajorVersion=21,ScriptMinorVersion=4,ScriptAttri butes=1)
Action start 11:11:55: InstallFinalize.
MSI (s) (B4:B4) [11:11:55:593]: Executing op:
ProductInfo(ProductKey={1CBE3804-20DF-48DA-B048-895C206E80A5},ProductName=Microsoft
SQL Server VSS
Writer,PackageName=SqlWriter.msi,Language=1033,Ver sion=150996343,Assignment=1,ObsoleteArg=0,ProductI con=ARPIco,,PackageCode={EA17DDB3-B05C-4451-A35C-CDA1F991A9F9},,,InstanceType=0,LUASetting=0,Remote URTInstalls=0)
MSI (s) (B4:B4) [11:11:55:593]: Executing op: DialogInfo(Type=0,Argument=1033)
MSI (s) (B4:B4) [11:11:55:593]: Executing op:
DialogInfo(Type=1,Argument=Microsoft SQL Server VSS Writer)
MSI (s) (B4:B4) [11:11:55:593]: Executing op:
RollbackInfo(,RollbackAction=Rollback,RollbackDesc ription=Rolling back
action:,RollbackTemplate=[1],CleanupAction=RollbackCleanup,CleanupDescription= Removing backup files,CleanupTemplate=File: [1])
MSI (s) (B4:B4) [11:11:55:593]: Executing op: SetBaseline(Baseline=0,)
MSI (s) (B4:B4) [11:11:55:593]: Executing op: SetBaseline(Baseline=1,)
MSI (s) (B4:B4) [11:11:55:593]: Executing op:
ActionStart(Name=ProcessComponents,Description=Upd ating component
registration,)
MSI (s) (B4:B4) [11:11:55:593]: Executing op:
ProgressTotal(Total=3,Type=1,ByteEquivalent=24000)
MSI (s) (B4:B4) [11:11:55:593]: Executing op:
ComponentRegister(ComponentId={B4F7448D-993A-49D2-8663-0A9DCD47368C},KeyPath=c:\Program
Files\Microsoft SQL
Server\90\Shared\sqlwvss_xp.dll,State=3,,Disk=1,Sh aredDllRefCount=0,BinaryType=0)
MSI (s) (B4:B4) [11:11:55:593]: Executing op:
ComponentRegister(ComponentId={EBBA2226-A910-4C1A-BF60-3251DE289B4D},KeyPath=c:\Program
Files\Microsoft SQL
Server\90\Shared\sqlwvss.dll,State=3,,Disk=1,Share dDllRefCount=0,BinaryType=0)
MSI (s) (B4:B4) [11:11:55:593]: Executing op:
ComponentRegister(ComponentId={B6B76479-5C2D-410A-8676-1E00B19D4976},KeyPath=c:\Program
Files\Microsoft SQL
Server\90\Shared\Resources\1033\sqlwriter.rll,Stat e=3,,Disk=1,SharedDllRefCount=0,BinaryType=0)
MSI (s) (B4:B4) [11:11:55:593]: Executing op:
ActionStart(Name=InstallFiles,Description=Copying new files,Template=File:
[1], Directory: [9], Size: [6])
MSI (s) (B4:B4) [11:11:55:593]: Executing op:
ProgressTotal(Total=370312,Type=0,ByteEquivalent=1 )
MSI (s) (B4:B4) [11:11:55:593]: Executing op:
SetTargetFolder(Folder=c:\Program Files\Microsoft SQL Server\90\Shared\)
MSI (s) (B4:B4) [11:11:55:593]: Executing op:
SetSourceFolder(Folder=1\PFiles\MICROS~1\90\Shared \|Program Files\Microsoft
SQL Server\90\Shared\)
MSI (s) (B4:B4) [11:11:55:593]: Executing op:
ChangeMedia(MediaVolumeLabel=SqlWriter,MediaPrompt =Please insert the disk:
,MediaCabinet=sqlwriter.cab,BytesPerTick=32768,Cop ierType=2,ModuleFileName=1\SqlWriter.msi,,,,,IsFir stPhysicalMedia=1)
MSI (s) (B4:B4) [11:11:55:593]: Executing op:
FileCopy(SourceName=sqlwvsxp.dll|sqlwvss_xp.dll,So urceCabKey=sqlwvss_xp.dll.C2AFB71B_502D_4615_867A_ F707CAC27E43,DestName=sqlwvss_xp.dll,Attributes=0, FileSize=175320,PerTick=32768,,VerifyMedia=1,,,,,C heckCRC=0,Version=2005.90.1399.0,Language=1033,Ins tallMode=58982400,,,,,,,)
MSI (s) (B4:B4) [11:11:55:593]: File: c:\Program Files\Microsoft SQL
Server\90\Shared\sqlwvss_xp.dll; To be installed; Won't patch; No existing
file
MSI (s) (B4:B4) [11:11:55:593]: Resolving source.
MSI (s) (B4:B4) [11:11:55:593]: User policy value 'SearchOrder' is 'nmu'
MSI (s) (B4:B4) [11:11:55:593]: User policy value 'DisableMedia' is 0
MSI (s) (B4:B4) [11:11:55:593]: Machine policy value 'AllowLockdownMedia' is 0
MSI (s) (B4:B4) [11:11:55:593]: SOURCEMGMT: Media enabled only if package is
safe.
MSI (s) (B4:B4) [11:11:55:593]: SOURCEMGMT: Looking for sourcelist for
product {1CBE3804-20DF-48DA-B048-895C206E80A5}
MSI (s) (B4:B4) [11:11:55:593]: SOURCEMGMT: Adding
{1CBE3804-20DF-48DA-B048-895C206E80A5}; to potential sourcelist list
(pcode;disk;relpath).
MSI (s) (B4:B4) [11:11:55:593]: SOURCEMGMT: Now checking product
{1CBE3804-20DF-48DA-B048-895C206E80A5}
MSI (s) (B4:B4) [11:11:55:593]: SOURCEMGMT: Media is enabled for product.
MSI (s) (B4:B4) [11:11:55:593]: SOURCEMGMT: Attempting to use LastUsedSource
from source list.
MSI (s) (B4:B4) [11:11:55:593]: SOURCEMGMT: Trying source
c:\096933c65ad8ac4a0fb0\Setup\.
MSI (s) (B4:B4) [11:11:55:593]: Note: 1: 2203 2:
c:\096933c65ad8ac4a0fb0\Setup\SqlWriter.msi 3: -2147287037
MSI (s) (B4:B4) [11:11:55:593]: SOURCEMGMT: Source is invalid due to
missing/inaccessible package.
MSI (s) (B4:B4) [11:11:55:593]: Note: 1: 1706 2: -2147483647 3: SqlWriter.msi
MSI (s) (B4:B4) [11:11:55:593]: SOURCEMGMT: Processing net source list.
MSI (s) (B4:B4) [11:11:55:593]: Note: 1: 1706 2: -2147483647 3: SqlWriter.msi
MSI (s) (B4:B4) [11:11:55:593]: SOURCEMGMT: Processing media source list.
MSI (s) (B4:B4) [11:11:55:625]: SOURCEMGMT: Trying media source E:\.
MSI (s) (B4:B4) [11:11:55:625]: Note: 1: 2203 2: E:\SqlWriter.msi 3:
-2147287038
MSI (s) (B4:B4) [11:11:55:625]: SOURCEMGMT: Source is invalid due to
missing/inaccessible package.
MSI (s) (B4:B4) [11:11:55:625]: Note: 1: 1706 2: -2147483647 3: SqlWriter.msi
MSI (s) (B4:B4) [11:11:55:625]: SOURCEMGMT: Processing URL source list.
MSI (s) (B4:B4) [11:11:55:625]: Note: 1: 1402 2: UNKNOWN\URL 3: 2
MSI (s) (B4:B4) [11:11:55:625]: Note: 1: 1706 2: -2147483647 3: SqlWriter.msi
MSI (s) (B4:B4) [11:11:55:625]: Note: 1: 1706 2: 3: SqlWriter.msi
MSI (s) (B4:B4) [11:11:55:625]: SOURCEMGMT: Failed to resolve source
MSI (s) (B4:E4) [11:23:47:265]: Running as a service.
MSI (s) (B4:E4) [11:23:47:328]: Running as a service.
MSI (s) (B4:E4) [11:23:47:328]: Generating random .
MSI (s) (B4:E4) [11:23:47:343]: Created Custom Action Server with PID 3556
(0xDE4).
MSI (s) (B4:68) [11:23:47:390]: Running as a service.
MSI (s) (B4:68) [11:23:47:406]: Hello, I'm your 32bit Impersonated custom
action server.
MSI (s) (B4:B4) [11:24:07:406]: Product: Microsoft SQL Server VSS Writer --
Error 1706. An installation package for the product Microsoft SQL Server VSS
Writer cannot be found. Try the installation again using a valid copy of the
installation package 'SqlWriter.msi'.

Error 1706. An installation package for the product Microsoft SQL Server VSS
Writer cannot be found. Try the installation again using a valid copy of the
installation package 'SqlWriter.msi'.
MSI (s) (B4:B4) [11:24:07:406]: User policy value 'DisableRollback' is 0
MSI (s) (B4:B4) [11:24:07:406]: Machine policy value 'DisableRollback' is 0
Action ended 11:24:07: InstallFinalize. Return value 3.
MSI (s) (B4:B4) [11:24:07:406]: Executing op:
Header(Signature=1397708873,Version=301,Timestamp= 895310204,LangId=1033,Platform=0,ScriptType=2,Scri ptMajorVersion=21,ScriptMinorVersion=4,ScriptAttri butes=1)
MSI (s) (B4:B4) [11:24:07:406]: Executing op: DialogInfo(Type=0,Argument=1033)
MSI (s) (B4:B4) [11:24:07:406]: Executing op:
DialogInfo(Type=1,Argument=Microsoft SQL Server VSS Writer)
MSI (s) (B4:B4) [11:24:07:406]: Executing op:
RollbackInfo(,RollbackAction=Rollback,RollbackDesc ription=Rolling back
action:,RollbackTemplate=[1],CleanupAction=RollbackCleanup,CleanupDescription= Removing backup files,CleanupTemplate=File: [1])
MSI (s) (B4:B4) [11:24:07:406]: Executing op:
ActionStart(Name=InstallFiles,Description=Copying new files,Template=File:
[1], Directory: [9], Size: [6])
MSI (s) (B4:B4) [11:24:07:406]: Executing op:
SetTargetFolder(Folder=c:\Program Files\Microsoft SQL Server\90\Shared\)
MSI (s) (B4:B4) [11:24:07:406]: Executing op:
ProductInfo(ProductKey={1CBE3804-20DF-48DA-B048-895C206E80A5},ProductName=Microsoft
SQL Server VSS
Writer,PackageName=SqlWriter.msi,Language=1033,Ver sion=150996343,Assignment=1,ObsoleteArg=0,ProductI con=ARPIco,,PackageCode={EA17DDB3-B05C-4451-A35C-CDA1F991A9F9},,,InstanceType=0,LUASetting=0,Remote URTInstalls=0)
MSI (s) (B4:B4) [11:24:07:406]: Executing op:
ActionStart(Name=ProcessComponents,Description=Upd ating component
registration,)
MSI (s) (B4:B4) [11:24:07:406]: Executing op:
ComponentRegister(ComponentId={B6B76479-5C2D-410A-8676-1E00B19D4976},KeyPath=c:\Program
Files\Microsoft SQL
Server\90\Shared\Resources\1033\sqlwriter.rll,Stat e=3,ProductKey={1CBE3804-20DF-48DA-B048-895C206E80A5},,SharedDllRefCount=0,BinaryType=0)
MSI (s) (B4:B4) [11:24:07:406]: Executing op:
ComponentRegister(ComponentId={EBBA2226-A910-4C1A-BF60-3251DE289B4D},KeyPath=c:\Program
Files\Microsoft SQL
Server\90\Shared\sqlwvss.dll,State=3,ProductKey={1 CBE3804-20DF-48DA-B048-895C206E80A5},,SharedDllRefCount=0,BinaryType=0)
MSI (s) (B4:B4) [11:24:07:421]: Executing op:
ComponentRegister(ComponentId={B4F7448D-993A-49D2-8663-0A9DCD47368C},KeyPath=c:\Program
Files\Microsoft SQL
Server\90\Shared\sqlwvss_xp.dll,State=3,ProductKey ={1CBE3804-20DF-48DA-B048-895C206E80A5},,SharedDllRefCount=0,BinaryType=0)
MSI (s) (B4:B4) [11:24:07:421]: Executing op:
End(Checksum=0,ProgressTotalHDWord=0,ProgressTotal LDWord=0)
MSI (s) (B4:B4) [11:24:07:421]: Error in rollback skipped. Return: 5
MSI (s) (B4:B4) [11:24:07:421]: No System Restore sequence number for this
installation.
MSI (s) (B4:B4) [11:24:07:421]: Unlocking Server
MSI (s) (B4:B4) [11:24:07:421]: PROPERTY CHANGE: Deleting UpdateStarted
property. Its current value is '1'.
Action ended 11:24:07: INSTALL. Return value 3.