1.) open "cmd"
2.) type in command "net stop "WuAuServ" (disable windows update)
3.) Head over to Run ( Win+R ) and type in "%windir%" (this command line enable you to head over to your microsoft windows system folder)
4.) Find the folder "SoftwareDistribution" and rename it as "SDold"
5.) Then, go back the previous command prompt and also run the command line "net start WuAuServ"
6.) At this point, try to install. NET Framework again.
