From http://answers.microsoft.com/en-us/windows/forum/windows_7-system/unable-to-install-any-application-error/fb0ca806-ce16-486f-84fc-5c0d82102f5a : 
从http://answers.microsoft.com/zh-cn/windows/forum/windows_7-system/unable-to-install-any-application-error/fb0ca806-ce16-486f-84fc-5c0d82102f5a ：
Usually this Microsoft.VC90.CRT error occurs due to corruption in Windows installer or .Net framework Please do not worry I will try my best to resolve it. 通常，此Microsoft.VC90.CRT错误是由于Windows安装程序或.Net框架 损坏而发生的。请不要担心，我会尽力解决它。 However I would require some more information to assist you better. 但是，我需要更多信息以更好地为您提供帮助。
- When exactly do you receive this error message? 您确切何时会收到此错误消息？
- Do you remember making any changes to the system prior to this issue? 您还记得在此问题之前对系统进行过任何更改吗？ I would suggest you to try the following methods: 我建议您尝试以下方法：
Method 1: Refer the below link to download and install the latest version of Microsoft Visual C++ 2008 Redistributable and check. 方法1：参考下面的链接以下载并安装最新版本的Microsoft Visual C ++ 2008 Redistributable并进行检查。 Microsoft Visual C++ 2008 SP1 Redistributable Package (x64) http://www.microsoft.com/downloads/en/details.aspx?familyid=ba9257ca-337f-4b40-8c14-157cfdffee4e&displaylang=en Microsoft Visual C ++ 2008 SP1可再发行组件包（x64） http://www.microsoft.com/downloads/zh-CN/details.aspx?familyid=ba9257ca-337f-4b40-8c14-157cfdffee4e&displaylang=en
Method 2: Check if the Windows installer service is running on the computer and is set to manual and service is started. 方法2：检查Windows安装程序服务是否正在计算机上运行，并且设置为手动，并且服务已启动。 a) Click Start menu in the search box type services.msc and then press Enter. a）在搜索框中，单击“开始”菜单，键入services.msc，然后按Enter。 b) In the Services (Local) list, right-click Windows Installer, and then click Properties. b）在“服务（本地）”列表中，右键单击“ Windows Installer”，然后单击“属性”。 c) If the Startup type drop-down list is set to a value of Disable, select the Manual option from the Startup type drop-down list, and then click OK. c）如果“启动类型”下拉列表设置为“禁用”，请从“启动类型”下拉列表中选择“手动”选项，然后单击“确定”。 d) Click the File menu, and then click Exit. d）单击文件菜单，然后单击退出。
Method 3: If the above step fails then reinstall .Net framework on the computer and check. 方法3：如果上述步骤失败，则在计算机上重新安装.Net framework并进行检查。 To turn Windows features on or off, follow these steps: a) Click the Start button, click Control Panel, click Programs, and then click Turn Windows features on or off. 若要打开或关闭Windows功能，请按照下列步骤操作：a）单击“开始”按钮，单击“控制面板”，单击“程序”，然后单击“打开或关闭Windows功能”。 If you're prompted for an administrator password or confirmation, type the password or provide confirmation. 如果系统提示您输入管理员密码或确认，请键入密码或提供确认。 b) To turn a Windows feature off, then uncheck box next to Microsoft .NET Framework 3.5.1. b）要关闭Windows功能，请取消选中Microsoft .NET Framework 3.5.1旁边的复选框。 c) Later click on Ok and restart the computer. c）稍后单击确定，然后重新启动计算机。 d) After the restart open Turn Windows features on or off again and to turn a Windows feature on, check box next to Microsoft .NET Framework 3.5.1. d）重新启动后，打开或再次打开Windows功能并打开Windows功能，请选中Microsoft .NET Framework 3.5.1旁边的复选框。 e) Later click on Ok and restart the computer. e）稍后单击确定，然后重新启动计算机。
Additional information: Turn Windows features on or off 附加信息：打开或关闭Windows功能
