I reinstalled Windows 8 on my HP Slate2 today, as I was having some problems with the current installation, which was an upgrade on top of the pre-installed Windows 7. Everything worked just fine, until I needed to install my wireless driver. I managed to install it by downloading from HP’s website, but then I got this message, An app on your PC needs the following Windows feature, referring to the .NET Framework 3.5. However, you simply cannot install this manually, it must be installed by using the Turn Windows features on or off functionality, accessible from the Programs and Features Control Panel applet. If you have an Internet connection, you should be fine at this point, but I wasn’t as I was trying to install the driver for the wireless hardware.
You need to open a Command Prompt in administrator mode, which can be done by opening Windows Explorer, browse to Windows\System32, locate cmd.exe, “right-click” or rather press and hold down your finger on cmd.exe, and then click Run as administrator. In the Command Prompt window you can run the following command: Dism /online /enable-feature /featurename:netfx3 /all /source:D:\sources\sxs /LimitAccess
- Dism.exe is a commandline tool you can use to enable/disable Windows features, see more here http://technet.microsoft.com/en-us/magazine/dd490958.aspx
- D:\sources\sxs is the path to the Windows 8 installation disc. Replace as required.