Disable Recommended Updates Windows 7 Registry
From ETCwiki
This will disable the downloading of Recommended Updates in Windows 7. You can use the .reg file or edit the registry manually.
Download Registry File: Rec-updates.reg
Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update] "IncludeRecommendedUpdates"=dword:00000000