Installing Windows 8.1, how I did it

[.Lb]

.NET framework v3.5 is not installed in Windows 8 by default, and is a required component for some software. Issue the following command from an elevated/administrator command prompt:

Dism /online /enable-feature /featurename:NetFx3 /All /Source:F:\sources\sxs /LimitAccess

(replace F:\ with the DVD drive/ USB where your Windows 8.1 installer is located. This will take a few minutes, be patient.