转载原文：
大二学数据库，课本以SQL server为例，自己看书比较快，自学sql server 2008高级编程时要安装示例数据库，发现自己装的express不能支持安装实例数据库，果断卸载重装，把sql server安装文件全部卸载删除，并且把注册表清理干净（不然重装可能会失败），然后重装sql server 2008sp2和SQLEXPRADV_x64_CHS.exe，重装真是问题多多啊
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：
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************** 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。
xp的在:C:\Documents and Settings\Administrator\Local Settings\Application Data\Microsoft_Corporation下（建议先备份一下）
进入安装后，刚开始最好设为windows默认登录，以后再添加账户，继续，为数据库指定实例名（第二次安装嘛不能用默认），指定管理员，继续下一步，然后为数据库express和报表服务设定为手动（不然安装后只要一开机数据库就会启动，很占资源使系统反应很慢），然后指定登录名和密码，由于系统登录账户没设密码，试了几次都发出错误警告：“[错误消息] 为 SQL Server 服务指定的凭据无效。若要继续操作，请为 SQL Server 服务提供有效的帐户和密码。 [详细信息] Microsoft.SqlServer.Configuration.SqlEngine.ValidationException: 为 SQL Server 服务指定的凭据无效。若要继续操作，请为 SQL Server 服务提供有效的帐户和密码。”，于是马上为账户设密码，安装程序可以继续下一步安装，安装进度比较慢。
为 AdventureWorks 数据库安装配置新的 SQL Server 实例可以参考微软官方网站的资料：http://msdn.microsoft.com/zh-cn/library/gg512108(v=vs.91).aspx?wa=wsignin1.0