There are still enough Macs and Linuxes that an amphibious or cross system vectoring malware could grab hold right now if it was anywhere close to as easy to get into the Macs and Linuxes as it is to get into most existing Windows installation.
Viruses are what they are but the threat isn’t there. It is in malware and a user will introduce it w/o even breaking a sweat.
Windows is secure on the latest versions but malware is the game.
“Look! A free copy of Tetris for my Mac!!!! All it does is ask me for a username and password!”
Bingo. Test the uid/password on Quicken, Wells Fargo, Chase, etc.
People get their panties in a wad over a DOS attack. The threat is monetary.
BTW, as a computer guy you should know that Windows of today is based on VMS.
My guess is that the original poster is not running a modern Windows variant or did the click and hope for the best method of implementation.
I do not buy this widespread virus spread we saw in the past (which was a problem, I agree).