I've seen portable Antivirus apps that will fit and run off a USB thumbdrive but how about portable Firewalls application, is there any than I can download and place on a USB stick/thumbdrive.
My God...!!! it's too heavy to carry a concrete firewall around. You have to be a superman to do that, I mean a super mouse... just kidding... Haven't heared and used yet a portable firewall. But, i think there's no need for that coz windows has its own built-in firewall capable enough to withstand inbound attacks from alien invasion.
For firewalls to work effectively in Windows, they need to make changes to system/network setup that require a reboot to take effect. This would greatly remove the point of such portability.
Here's one called AS3 but it only has IP/Port control - no app control: http://www.software4u.tk/ Install it and copy the folder to your USB drive. No driver installed. It does add a reg key though.
i dont see the use of having a firewall on a usb key. if u want to protect the data on ur drive, u can try a portable encryption tool. mcafee was supposed to have antivirus and firewall for U3 drives a while back, but i guess its nonexistent now.