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Generally, non-programming users install this to provide running controls for C++ programs. Simply put, some programs may require support from this software to run well. For example, many software and games in windws require this program to run in order to run. In the early winXP win7 direct installation on the line, but in win8 and win10, Microsoft installed net framework 3.5 actually has a bug, can not be directly installed, you need to extract the iso original file to install, as shown below, win10 directly install net framework 3.5 will show that the installation fails. 
Now teach everyone to install net framework 3.5 in win10, you first need to download the original version of win10 system (the average person has the original version of the system, if not, you can click here to download, backup next time install net framework 3.5 or reload win10 next time The system is convenient to use.) After downloading the win10 original system, right-click to select the load, as shown below. 
The purpose of this is to load the original iso system into the virtual drive, as shown in the following figure, you have a partition in your computer. (I have a G drive in my computer) 
Then at this time, win+R opens the command and enters cmd Enter to confirm, then copy and paste: Dism /online /enable-feature /featurename:NetFX3 /All /Source:G:sourcessxs /LimitAccess Source:G in the above command : G disk is based on your specific situation, that is, for example, if you have CDD three disks, then the load will be E disk to write Source: E, I think my computer has CDEF four disks before. The loaded virtual drive is the G drive, and all the above are filled with the G drive. Then press Enter to confirm that if the following figure shows, win10 net framework 3.5 will be installed successfully when prompted to install 100%. This method is the easiest. 
Win10 net framework 3.5 can not be installed solution
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