Governments and joe public only understand two things or options. So if there is a choice you can only give then two, ie, yes or no, Windows of Mac, Internet Exploder or Firefox, give it or I take it anyway.
In the mean time they will simply supply monitoring software that probably only works on Windows, because it will support all operating systems [Windows XP, Windows Vista, and Windows 7]. It will be up to you to decide on were you get the software for AntiVirus/Malware/Firewall from, after all, the Government isn't in the antiviral and malware business, yet.
Or, they will mandate it that the ISP has to ask the customer at point of signup if they have AntiVirus and a Firewall installed, and leave it up to the customer to say yes or no
As I don't run Windows or Mac, only AIX and something else, I would of cause reply in the affirmative.