win8.1 Framework3.5 not installed on the problem

Problem Symptom: Installation of WIN8 system cannot install Framework,sql etc.

Troubleshooting: Install directly or update it online (as a result of various errors)

Workaround:

1, first gpedit.msc into the local Group Policy Management, directory: Computer Configuration, Administrative Templates, System----Specify optional component installation and attachment repair

2, load the win system as a mirrored disk, such as I disk

3. Double-click Specify Optional component installation and attachment repair, set enabled, alternate source usage path set to: I:\sources\sxs

4, administrator rights to run the console, enter the following command, installed as 100%

C:\windows\system32>dism.exe/online/enable-feature/featurename:netfx3/source
I:\sources\sxs/limitaccess

win8.1 Framework3.5 not installed on the problem