OK, I understand one does not need a separate copy of Linux, and even that one does not need to know much about Linux to install it.johnwill said:Smoothwall is a complete package that's based on Linux. You don't need a separate copy of Linux, and you don't need to know anything about Linux to install and use Smoothwall.
But according to the Smoothwall documentation (http://download.smoothwall.org/archive/docs/2.0/quickstart.pdf)
"Any data stored on the hard drive of the PC on which SmoothWall is to be installed will be overwritten as part of the installation, so it is imperative prior to SmoothWall installation to back up any data that is considered valuable. Do NOT install SmoothWall Express onto your main or only PC - you WILL lose all the data on the hard disk." And, according to the documentation, "After the reboot, when SmoothWall Express has been initialised and is ready for use, you should be presented with a simple Unix/Linux style Login screen."
This rather means that any prior use of the PC as a Windows PC is gone. Which, at the risk of repeating myself, may not be a viable option here.
I think that as a stop-gap measure using ICS on the existing Windows box until a router is acquired is probably the least disruptive option.