0.Insert Windows 8 or 8.1 Installation Disk
1.Right click on windows start button
2.Select Command Prompt (Admin)
3.Copy & Paste this code without quotes
"Dism /online /enable-feature /featurename:NetFx3 /All/Source:D:\sources\sxs /LimitAccess"
5.Hit Enter
6. It'll take a few minutes and you'll get a message that the operation completed successfully.
NOTE:
If u have different letter for indicate DVD drive in your PC then u must change the letter in highlighted in the given code...
(ex: D to F)