Another way to control outbound traffic is to use a software firewall on your computer. Let the netgear router stop any inbound Blaster/Sasser type attacks etc. and use the software firewall to control programs on your computer. Zone Alarm and Norton Personal Firewall are quite easy to set up and, after a week or so of use, very unobtrusive. Whenever Zone Alarm et al detects a program trying to get out, they ask you whether it should be allowed. Many can also be set to completely shut down all internet access after a certain period of inactivity.
You should definitely take HelenD's advice to block all traffic on ports 135-139 as these are used by Windows' LAN networking software. There is no need for local network traffic to get out onto the net and hackers love to scan these ports for vulnerable computers.
goates