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After windows7 automatic updated system, C drive become smaller , how to remove the residual files left behind after the updated,  could SoftwareDistribution folder be deleted it? How to remove windows 7 updates from the list that have downloaded? Here is the method:

Windows 7 update file is really saved in the% windir% \ SoftwareDistribution folder. To clear this folder, I suggest the following run the following command at the command prompt  as an administrator:

net stop wuauserv
ren% windir% \ SoftwareDistribution SD.old
net start wuauserv

Now, the original SoftwareDistribution folder has been renamed into SD.old, and if Automatic Updates Windows 7 operating normally, you can delete SD.old this folder.