Windows 8.1 Update 1
For best results this major update should be installed via a clean installation using up to date installation media. – See Download Windows 8.1 Retail and OEM .iso.
Windows Defender Latest Definitions
The latest standalone security defintions for Windows Defender are here:
Enabling Microsoft .Net Framework in Windows 8.1
This guide starts of with a video, the additional written notes with the weblinks which compliment the video are given below…
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Microsoft .Net 3.5 and 4.5 aren't installed by default in Windows 8.1 which are necessary prerequisites for many programs to run. Unfortunately Microsoft never provided them as a standalone update for Windows 8.1. The easiest way to add these is via add/remove Windows features however if an offline install is required detailed instructions are give in KB2785188. Open up Windows Explorer by pressing [Ctrl] and [e] go to computer > Uninstall or Change a Program.
Select Turn Windows Features On or Off.
Scroll down until you get to,Net Framework 3.5 and check all the boxes for ,Net Framework 3.5 and 4.0 as shown.
Likely you will need to connect to Windows Update
Windows will download the files and then install and apply changes.
You can restart the computer by right clicking the start button and selecting restart.
WSUS Offline Update
Its recommended to use this utility which downloads all the updates for your version of Windows and saves them to a .iso. You then copy the .iso to the computer after the clean install and launch the updater. This will automatically fully update Windows.