win8无法安装net3.5怎么办?
1. 打开 win8 安装盘，提取 sources/sxs 文件夹到 d:/sources/sxs (或别的盘也行，举个例子);
2. 打开 c:/windows/system32 文件夹，找到 cmd.exe，右击，选择"Run as administrator";
3. 在命令行执行以下命令：
dism.exe /online /enable-feature /featurename:NetFX3 /Source:d:/sources/sxs (就是第一步提取出来的)
大概一两分钟就执行完了，执行结果如下：
Deployment Image Servicing and Management tool
Version: 6.2.8250.0
Image Version: 6.2.8250.0
Enabling feature(s)
[==========================100.0%==========================]
The operation completed successfully.
搞定~~
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