在安装SQL2005的过程中：
Microsoft SQL Server 2005 Setup中显示如下：
“SQL Server Component Update will install the following components required for SQL Server Setup:
NET Framework2.0
Microsoft SQL Native Client
Mictosoft SQL Server 2005 Setup Support Files

Errors occurred during the installation:
Errors 1601 installing.NET Framework 2.0.See log file for more detaiked information.
无法访问Windows 安装服务。发生这种情况的可能是您的安全模式下运行Windows,或者没有正确安装Windows安装，。请与技术支持人员联系以获得帮助。”
Log file里面的内容是
=== Verbose logging started: 2011-6-7 19:43:51 Build type: SHIP UNICODE 4.05.6001.00 Calling process: C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\IXP000.TMP\install.exe ===
MSI (c) (14:3C) [19:43:51:718]: SOFTWARE RESTRICTION POLICY: Verifying package --> 'C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\IXP000.TMP\netfx.msi' against software restriction policy
MSI (c) (14:3C) [19:43:51:718]: SOFTWARE RESTRICTION POLICY: C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\IXP000.TMP\netfx.msi has a digital signature
MSI (c) (14:3C) [19:43:52:781]: SOFTWARE RESTRICTION POLICY: C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\IXP000.TMP\netfx.msi is permitted to run at the 'unrestricted' authorization level.
MSI (c) (14:3C) [19:44:22:828]: 连接到服务器失败。错误: 0x80080005

MSI (c) (14:3C) [19:44:22:859]: End dialog not enabled
MSI (c) (14:3C) [19:44:22:859]: Original package ==> C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\IXP000.TMP\netfx.msi
MSI (c) (14:3C) [19:44:22:859]: Package we're running from ==> C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\IXP000.TMP\netfx.msi
MSI (c) (14:3C) [19:44:22:906]: APPCOMPAT: looking for appcompat database entry with ProductCode '{7131646D-CD3C-40F4-97B9-CD9E4E6262EF}'.
MSI (c) (14:3C) [19:44:22:906]: APPCOMPAT: no matching ProductCode found in database.
MSI (c) (14:3C) [19:44:22:906]: MSCOREE not loaded loading copy from system32
MSI (c) (14:3C) [19:44:22:906]: Machine policy value 'TransformsSecure' is 0
MSI (c) (14:3C) [19:44:22:906]: User policy value 'TransformsAtSource' is 0
MSI (c) (14:3C) [19:44:22:906]: Machine policy value 'DisablePatch' is 0
MSI (c) (14:3C) [19:44:22:906]: Machine policy value 'AllowLockdownPatch' is 0
MSI (c) (14:3C) [19:44:22:906]: Machine policy value 'DisableLUAPatching' is 0
MSI (c) (14:3C) [19:44:22:906]: Machine policy value 'DisableFlyWeightPatching' is 0
MSI (c) (14:3C) [19:44:22:906]: APPCOMPAT: looking for appcompat database entry with ProductCode '{7131646D-CD3C-40F4-97B9-CD9E4E6262EF}'.
MSI (c) (14:3C) [19:44:22:906]: APPCOMPAT: no matching ProductCode found in database.
MSI (c) (14:3C) [19:44:22:906]: Transforms are not secure.
MSI (c) (14:3C) [19:44:22:921]: Note: 1: 2205 2: 3: Control
MSI (c) (14:3C) [19:44:22:921]: PROPERTY CHANGE: Adding MsiLogFileLocation property. Its value is 'c:\program files\microsoft sql server\90\setup bootstrap\log\files\sqlsetup0001_62e96fd258cd481_.net framework 2.0.log'.
MSI (c) (14:3C) [19:44:22:921]: No Command Line.
MSI (c) (14:3C) [19:44:22:921]: PROPERTY CHANGE: Adding PackageCode property. Its value is '{BFC5E8EF-C140-454A-9B47-EEC73A4AAB3F}'.
MSI (c) (14:3C) [19:44:22:921]: Product Code passed to Engine.Initialize: '(none)'
MSI (c) (14:3C) [19:44:22:921]: Product Code from property table before transforms: '{7131646D-CD3C-40F4-97B9-CD9E4E6262EF}'
MSI (c) (14:3C) [19:44:22:921]: Product Code from property table after transforms: '{7131646D-CD3C-40F4-97B9-CD9E4E6262EF}'
MSI (c) (14:3C) [19:44:22:921]: Product not registered: beginning first-time install
MSI (c) (14:3C) [19:44:22:921]: PROPERTY CHANGE: Adding ProductState property. Its value is '-1'.
MSI (c) (14:3C) [19:44:22:921]: Entering CMsiConfigurationManager::SetLastUsedSource.
MSI (c) (14:3C) [19:44:22:921]: User policy value 'SearchOrder' is 'nmu'
MSI (c) (14:3C) [19:44:22:921]: Adding new sources is allowed.
MSI (c) (14:3C) [19:44:22:921]: PROPERTY CHANGE: Adding PackagecodeChanging property. Its value is '1'.
MSI (c) (14:3C) [19:44:22:921]: Package name extracted from package path: 'netfx.msi'
MSI (c) (14:3C) [19:44:22:921]: Package to be registered: 'netfx.msi'
MSI (c) (14:3C) [19:44:22:921]: Note: 1: 2262 2: AdminProperties 3: -2147287038
MSI (c) (14:3C) [19:44:22:921]: Machine policy value 'DisableMsi' is 0
MSI (c) (14:3C) [19:44:22:921]: Machine policy value 'AlwaysInstallElevated' is 0
MSI (c) (14:3C) [19:44:22:921]: User policy value 'AlwaysInstallElevated' is 0
MSI (c) (14:3C) [19:44:22:921]: Product installation will be elevated because user is admin and product is being installed per-machine.
MSI (c) (14:3C) [19:44:22:921]: Running product '{7131646D-CD3C-40F4-97B9-CD9E4E6262EF}' with elevated privileges: Product is assigned.
MSI (c) (14:3C) [19:44:22:921]: TRANSFORMS property is now:
MSI (c) (14:3C) [19:44:22:921]: PROPERTY CHANGE: Adding VersionDatabase property. Its value is '200'.
MSI (c) (14:3C) [19:44:22:921]: SHELL32::SHGetFolderPath returned: C:\Documents and Settings\Administrator\Application Data
MSI (c) (14:3C) [19:44:22:921]: SHELL32::SHGetFolderPath returned: C:\Documents and Settings\Administrator\Favorites
MSI (c) (14:3C) [19:44:22:921]: SHELL32::SHGetFolderPath returned: C:\Documents and Settings\Administrator\NetHood
MSI (c) (14:3C) [19:44:22:921]: SHELL32::SHGetFolderPath returned: C:\Documents and Settings\Administrator\My Documents
MSI (c) (14:3C) [19:44:22:921]: SHELL32::SHGetFolderPath returned: C:\Documents and Settings\Administrator\PrintHood
MSI (c) (14:3C) [19:44:22:921]: SHELL32::SHGetFolderPath returned: C:\Documents and Settings\Administrator\Recent
MSI (c) (14:3C) [19:44:22:921]: SHELL32::SHGetFolderPath returned: C:\Documents and Settings\Administrator\SendTo
MSI (c) (14:3C) [19:44:22:921]: SHELL32::SHGetFolderPath returned: C:\Documents and Settings\Administrator\Templates
MSI (c) (14:3C) [19:44:22:921]: SHELL32::SHGetFolderPath returned: C:\Documents and Settings\All Users\Application Data
MSI (c) (14:3C) [19:44:22:921]: SHELL32::SHGetFolderPath returned: C:\Documents and Settings\Administrator\Local Settings\Application Data
MSI (c) (14:3C) [19:44:22:921]: SHELL32::SHGetFolderPath returned: C:\Documents and Settings\Administrator\My Documents\My Pictures
MSI (c) (14:3C) [19:44:22:921]: SHELL32::SHGetFolderPath returned: C:\Documents and Settings\All Users\「开始」菜单\程序\管理工具
MSI (c) (14:3C) [19:44:22:921]: SHELL32::SHGetFolderPath returned: C:\Documents and Settings\All Users\「开始」菜单\程序\启动
MSI (c) (14:3C) [19:44:22:921]: SHELL32::SHGetFolderPath returned: C:\Documents and Settings\All Users\「开始」菜单\程序
MSI (c) (14:3C) [19:44:22:921]: SHELL32::SHGetFolderPath returned: C:\Documents and Settings\All Users\「开始」菜单
MSI (c) (14:3C) [19:44:22:921]: SHELL32::SHGetFolderPath returned: C:\Documents and Settings\All Users\桌面
MSI (c) (14:3C) [19:44:22:921]: SHELL32::SHGetFolderPath returned: C:\Documents and Settings\Administrator\「开始」菜单\程序\管理工具
MSI (c) (14:3C) [19:44:22:921]: SHELL32::SHGetFolderPath returned: C:\Documents and Settings\Administrator\「开始」菜单\程序\启动
MSI (c) (14:3C) [19:44:22:921]: SHELL32::SHGetFolderPath returned: C:\Documents and Settings\Administrator\「开始」菜单\程序
MSI (c) (14:3C) [19:44:22:921]: SHELL32::SHGetFolderPath returned: C:\Documents and Settings\Administrator\「开始」菜单
MSI (c) (14:3C) [19:44:22:921]: SHELL32::SHGetFolderPath returned: C:\Documents and Settings\Administrator\桌面
MSI (c) (14:3C) [19:44:22:921]: SHELL32::SHGetFolderPath returned: C:\Documents and Settings\All Users\Templates
MSI (c) (14:3C) [19:44:22:921]: SHELL32::SHGetFolderPath returned: C:\WINDOWS\Fonts
MSI (c) (14:3C) [19:44:22:921]: Note: 1: 2898 2: MS Sans Serif 3: MS Sans Serif 4: 0 5: 16
MSI (c) (14:3C) [19:44:22:921]: MSCOREE not loaded loading copy from system32
MSI (c) (14:3C) [19:44:22:921]: PROPERTY CHANGE: Adding Privileged property. Its value is '1'.
MSI (c) (14:3C) [19:44:22:921]: Note: 1: 1402 2: HKEY_CURRENT_USER\Software\Microsoft\MS Setup (ACME)\User Info 3: 2
MSI (c) (14:3C) [19:44:22:921]: PROPERTY CHANGE: Adding USERNAME property. Its value is '微软用户'.
MSI (c) (14:3C) [19:44:22:921]: Note: 1: 1402 2: HKEY_CURRENT_USER\Software\Microsoft\MS Setup (ACME)\User Info 3: 2
MSI (c) (14:3C) [19:44:22:921]: PROPERTY CHANGE: Adding COMPANYNAME property. Its value is '微软中国'.
MSI (c) (14:3C) [19:44:22:921]: PROPERTY CHANGE: Adding DATABASE property. Its value is 'C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\IXP000.TMP\netfx.msi'.
MSI (c) (14:3C) [19:44:22:921]: PROPERTY CHANGE: Adding OriginalDatabase property. Its value is 'C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\IXP000.TMP\netfx.msi'.
MSI (c) (14:3C) [19:44:22:921]: Machine policy value 'MsiDisableEmbeddedUI' is 0
MSI (c) (14:3C) [19:44:22:921]: EEUI - Disabling MsiEmbeddedUI due to existing external or embedded UI
MSI (c) (14:3C) [19:44:22:921]: EEUI - Disabling MsiEmbeddedUI in quiet mode
=== 记录开始: 2011-6-7 19:44:22 ===
MSI (c) (14:3C) [19:44:22:921]: Note: 1: 2262 2: PatchPackage 3: -2147287038
MSI (c) (14:3C) [19:44:22:921]: Machine policy value 'DisableRollback' is 0
MSI (c) (14:3C) [19:44:22:921]: User policy value 'DisableRollback' is 0
MSI (c) (14:3C) [19:44:22:921]: PROPERTY CHANGE: Adding UILevel property. Its value is '2'.
MSI (c) (14:3C) [19:44:22:921]: MsiOpenPackageEx is returning 0
MSI (c) (14:3C) [19:44:22:921]: MsiOpenPackage is returning 0
=== Verbose logging stopped: 2011-6-7 19:44:22 ===

=== Verbose logging started: 2011-6-7 19:44:22 Build type: SHIP UNICODE 4.05.6001.00 Calling process: C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\IXP000.TMP\install.exe ===
MSI (c) (14:28) [19:44:22:937]: Resetting cached policy values
MSI (c) (14:28) [19:44:22:937]: Machine policy value 'Debug' is 0
MSI (c) (14:28) [19:44:22:937]: ******* RunEngine:
******* Product: C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\IXP000.TMP\netfx.msi
******* Action:
******* CommandLine: **********
MSI (c) (14:28) [19:44:22:937]: Client-side and UI is none or basic: Running entire install on the server.
MSI (c) (14:28) [19:44:22:937]: Grabbed execution mutex.
MSI (c) (14:28) [19:44:52:953]: 连接到服务器失败。错误: 0x80080005

MSI (c) (14:28) [19:44:52:953]: Failed to connect to server.
MSI (c) (14:28) [19:44:52:953]: MainEngineThread is returning 1601
=== Verbose logging stopped: 2011-6-7 19:44:52 ===



我的系统是SP3的注册表按照以下方式更改：
修改注册表 ：

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Windows XP\SP3\KB319740]
"Des cription"="Windows XP 修补程序包 - KB319740"

还有一个办法就是这么修改的 ：

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Windows]
"CSDVersion"=dword:00000200

原来00000300 改为 00000200