I haven't looked at the link given...
But for the PCs running Windows on my network (not many to be honest) I use:
AVG free virus scanner on each PC;
Zone Alarm Pro on each computer (As the Pro version has better support for networks) for the firewalls - I can't afford a hardware firewall as of
yet, but I may dig out an old un-used PC and install Linux on it and use it as the firewall for the network.
Search and destroy for the spy-ware;
And thats about it... Maybe not the best security but almost all free.
For good free security (well as good as Windoze can be, lol) you could just use the Free AVG and Free Zone Alarm.
These are my recommendations anyway.
If you don't mind paying money, I would go for BlackIce for firewall (and/or a Linux hardware firewall).