No Windows 7 Home Premium:
Start - Control Panel - Firewall - "Advanced Settings"
This will open up "Windows Firewall with Advanced Security" Window
Click on "Outbound Rules" and "New Rule"
Rule Type: Custom
Program: All Programs
Protocol and Ports: Any
Scope: Any IP Address (both local and remote)
Action: Block the connection
Profile: Domain and Private (Untick Public)
Name: Make a name for this rule
Click on Finish
E agora você tem uma regra de saída que impede que todos os aplicativos acessem qualquer IP em qualquer porta em domínio e privada (rede doméstica ou comercial ou privada)