Solve the problem that Win8 can't upgrade .NET Framework 3.5.1

With the release of win8, many Win8 fans have installed Win8, and finally encountered the problem of not being able to upgrade the .NET Framework 3.5.1, online upgrade will encounter the prompt error 0x800F0906. Even more frustrating is that almost all solutions on the Internet are invalid. Still enthusiastic netizens solved this problem, and now the system home Xiaobian came out to share with you.
Methods and Steps:
Step 1. Open the win8 installation disk and extract the sources\\sxs folder to d:\\sources\\sxs (or another disk, for example);
Step 2. Open the c:\\windows\\system32 folder, find cmd.exe, right-click and select "Run as administrator";
Step 3. Execute the following command from the command line:
dism.exe /online /enable- Feature /featurename:NetFX3 /Source:d:\\sources\\sxs (that is, the first step is extracted)
It takes about a minute or two to execute. The result is as follows:
Deployment Image Servicing and Management tool
Version: 6.2.8250.0
Image Version: 6.2.8250.0
Enabling feature(s)
[========================= ==100.0%==================================== The operation completed successfully.
Get it~~