安装了VS2010 sp1 后再安装ASP.NET MVC 3.0的问题（Final Result: Installation failed with error code: (0x80070643), "安装时发生严重错误 " (Elapsed time: 0 00:03:59).Product: NuGet -- A later version of NuGet is already installed. Setup will now exit.
安装文件：AspNetMVC3ToolsUpdateSetup.exe 下载地址：
http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=1491
使用7-zip解压缩AspNetMVC3ToolsUpdateSetup.exe文件：目录里如下两个文件：
aspnetmvc3.msi和 aspnetmvc3vs2010tools.msi，按照先后顺序安装即可。这样mvc3.0在VS2010里就可以使用了。
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