Win8 can't upgrade .NET Framework 3.5.1 solution

        Many people have encountered the problem of not being able to upgrade .NET Framework 3.5.1 after installing Win8. Online upgrade will encounter error 0x800F0906. This makes 91 mobile assistants and many other software can not run, more depressingly, almost all the solutions on the Internet are invalid: there are said to uninstall the Chinese language package. But Win8 (x64) English version is the same error; there is a cleanup of a certain registry key can be installed, in fact, this key does not exist at all; there are said that Microsoft downloads the independent installation package, in fact, even if you run the independent installation package Jump to Windowsupdate to install online and then still fail. Entered, at Win8 install .Netframework3.5.1 following steps:

1. Open Windows8 installation disk, the folder to extract sourcessxs d: sourcessxs (or also line other plate, for example);

2. open the c: Windowssystem32 folder, find cmd.exe, right click and select "Runasadministrator";

3. execute the following command at the command line:

dism .exe /online /enable-feature /featurename: NetFX3 /Source: d: sourcessxs (the first step is extracted)

about a minute or two finished execution, execution results are as follows:

DeploymentImageServicingandManagementtool

Version: 6.2.8250.0

ImageVersion: 6.2.8250.0

Enablingfeature (s)

[========= =================100.0%=================================================== BR> TheOperationcompletedsuccessfully.