How to Fix Error Code 0x800f081f When Installing .NET Framework 3.5
1- First Download this file from this link.
2- After Download Copy and paste in C Drive. (Paste only c drive not any folder) .
3- Now Open CMD (Run as Administration).
4- After Open Paste this data in cmd
Dism.exe /online /enable-feature /featurename:NetFX3 /source:C:\ /LimitAccess
After Paste Press Enter Three-time now starts process 0 to 100%.
After Complete 100% Your Problem is Resolved.