开始安装SQL Server 2008 R2遇到配置错误的解决办法

原文地址：http://hi.baidu.com/liuzhiyong2009/blog/item/51828def7db9e6ecb3fb9567.html

在Windows 7下试图将SQL Server 2008 Express升级为R2版时，还未能进入安装界面，就抛出异常。以下是异常的部分信息：

See the end of this message for details on invoking

just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************

System.Configuration.ConfigurationErrorsException: An error occurred creating the configuration section handler for userSettings/Microsoft.SqlServer.Configuration.LandingPage.Properties.Settings: Could not load file or assembly 'System, Version=4.0.0.0, Culture=neutral,
P licKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified. (C:\Users\<当前用户>\AppData\Local\Microsoft_Corporation\LandingPage.exe_StrongName_ryspccglaxmt4nhllj5z3thycltsvyyx\10.0.0.0\user.config line 5) ---> System.IO.FileNotFoundException:
Could not load file or assembly 'System, Version=4.0.0.0, Culture=neutral, P licKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified.

File name: 'System, Version=4.0.0.0, Culture=neutral, P licKeyToken=b77a5c561934e089'

at System.Configuration.TypeUtil.GetTypeWithReflectionPermission(IInternalConfigHost host, String typeString, Boolean throwOnError)

at System.Configuration.RuntimeConfigurationRecord.RuntimeConfigurationFactory.Init(RuntimeConfigurationRecord configRecord, FactoryRecord factoryRecord)

at System.Configuration.RuntimeConfigurationRecord.RuntimeConfigurationFactory.InitWithRestrictedPermissions(RuntimeConfigurationRecord configRecord, FactoryRecord factoryRecord)

at System.Configuration.RuntimeConfigurationRecord.CreateSectionFactory(FactoryRecord factoryRecord)

at System.Configuration.BaseConfigurationRecord.FindAndEnsureFactoryRecord(String configKey, Boolean& isRootDeclaredHere)

WRN: Assembly binding logging is turned OFF.

To enable assembly bind failure logging, set the registry val [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.

Note: There is some performance penalty associated with assembly bind failure logging.

To turn this feature off, remove the registry val [HKLM\Software\Microsoft\Fusion!EnableLog].

解决方法：

将C:\Users\<当前用户>\AppData\Local\Microsoft_Corporation\文件夹下的LandingPage.exe*文件夹删除，再运行安装程序即正常。

解决方法来自：http://social.msdn.microsoft.com/Forums/en/sqlkjsetupandupgrade/thread/35356bf2-6db7-4785-a104-bc62d18913f7