Win7 can not automatically update how to do

After entering win7, want to update the system, who knows that click "automatic update", but it appears: windows update can not check the update, because the service is not running, you may need to restart the computer. depressed! First look at the update corresponding service: Computer---------------------------------------------------- So clicked "restart" to restart the service, but still did not solve the problem. Found a solution: Open a command prompt window as an administrator and run the following command: net stop WuAuServ cd %windir% ren SoftwareDistribution SDold net start WuAuServ No need to reboot, click Windows Update, OK! The reason why this problem occurs, I guess it should be a few days ago to clean up the C drive, accidentally deleted the SoftwareDistribution folder file.