I search it on the internet but no solution found. Today I will show you how to solve this kind of error. Just follow the steps in the video and everything should work after following the this video tutorial.

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.

To start a command prompt as an administrator
Click Start, click All Programs, and then click Accessories.
Right-click Command prompt, and then click Run as administrator.
If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Continue.