Win7 error prompt 0x000006d18 how to do

1, shortcut key WIN + R, open the run menu, run CMD.exe this program, right-click on this program --- run as administrator.

2. In the cmd program after running, I type: net stop WuAuServ, then press Enter to close the service.

3, enter again: echo %windir%, and then press Enter, a folder will pop up.
4, found in the pop-up folder: SoftwareDistribution, right-click the folder to rename it to SDold.
5, after the successful modification, enter again in the cmd program: net start WuAuServ, then enter the service to open the car, re-install .net everything is installed normally.