This method shows you how to delete Windows Update Files using Command Prompt

 http://www.computerstepbystep.com/windows-7-7-windows-update-files.html

This method shows you how to delete Windows Update Files using Command Prompt

Please perform the following steps:
In the Command Prompt window please select, copy and paste the following commands:
net stop wuauservren %systemroot%\SoftwareDistribution SoftwareDistribution.oldnet start wuauservrd /s/q %systemroot%\SoftwareDistribution.old
After each command please press Enter