diff --git a/assets/winvistax64-ultimate.cmd b/assets/winvistax64-ultimate.cmd
index 12de6a0c..d041ff41 100644
--- a/assets/winvistax64-ultimate.cmd
+++ b/assets/winvistax64-ultimate.cmd
@@ -90,6 +90,9 @@ reg.exe add "HKLM\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services" /v "
 rem Disable RemoteApp allowlist.
 reg.exe add "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Terminal Server\TSAppAllowList" /v "fDisabledAllowList" /t REG_DWORD /d 1 /f
 
+rem Turn off automatic Windows Update downloads.
+reg.exe add "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update" /v "AUOptions" /t REG_DWORD /d 1 /f
+
 rem Enable Network Discovery.
 netsh advfirewall firewall set rule group="@FirewallAPI.dll,-32752" new enable=Yes