Good evening :)
I'd like to share "How To Install .NetFX in Windows 8"
Preparation : ISO of Win8 or Win8 DVD
1. Mount the iso / dvd
2. Copy folder Source in Mounted ISO / DVD into drive D: or E: or wherever you want
3. Open CMD / Command Prompt with Administrator Privilege
4. Type "Dism.exe /online /enable-feature /featurename:NetFX3 /All /Source:D:\sources\sxs /LimitAccess" *without quotes*
5. Wait... and Viola! .NetFX has been installed on your system :)
NB : If you put "sources" folder in drive E: just replace "D:" to "E:"