Welcome to Super User. You could create a scheduled task which runs when connected to a specific Wi-Fi network, and that disables Windows updates temporarily. As for the antivirus, turning off its update feature might or might not be possible. Which exact version are you using? You might want to rephrase your question a little, because asking for tools might be interpreted as a software recommendation, and that's off-topic here. – and31415 Jun 29 '14 at 10:29