在Win2008安装XNA的时候遇到错误，老是装不上，于是采用手动安装的办法
1、进入命令行，CD到下载的文件夹，输入xnags31_setup.exe /x，把安装包解压到一个文件夹
2、去到上面的文件夹，找到redists.msi安装
3、按照以下顺序找到对应的文件运行安装
%ProgramFiles%\Microsoft XNA\XNA Game Studio\v3.1\Setup\XLiveRedist.msi
%ProgramFiles%\Microsoft XNA\XNA Game Studio\v3.1\Redist\XNA FX Redist\xnafx30_redist.msi
%ProgramFiles%\Microsoft XNA\XNA Game Studio\v3.1\Redist\XNA FX Redist\xnafx31_redist.msi
%ProgramFiles%\Microsoft XNA\XNA Game Studio\v3.1\Setup\xnaliveproxy.msi
%ProgramFiles%\Microsoft XNA\XNA Game Studio\v3.1\Setup\xnags_platform_tools.msi
%ProgramFiles%\Microsoft XNA\XNA Game Studio\v3.1\Setup\xnags_shared.msi
%ProgramFiles%\Microsoft XNA\XNA Game Studio\v3.1\Setup\platformer.msi
%ProgramFiles%\Microsoft XNA\XNA Game Studio\v3.1\Setup\xnags_documentation.msi
4、如果你安装有Visual C# 2008 Express，就安装%ProgramFiles%\Microsoft XNA\XNA Game Studio\v3.1\Setup\xnags_vcsexpress.msi
5、如果你安装有Visual Studio 2008，就安装%ProgramFiles%\Microsoft XNA\XNA Game Studio\v3.1\Setup\xnags_devenv.msi
6、去到第1步中的文件夹，安装arpentry.msi
这样XNA 3.1就手动安装完成了