Ok, nice find. You can add these registry entries in one of your inf files: [REGEntries.AddReg] HKLM,"SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU","RebootRelaunchTimeoutEnabled",0x10001,01,00,00,00 HKLM,"SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU","RebootRelaunchTimeout",0x10001,a0,05,00,00 HKLM,"SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU","NoAutoRebootWithLoggedOnUsers",0x10001,01,00,00,00Then the trick would work (dunno if it does what you want, though)