I'm demanding that any professional digital oscilloscope should not rely on the windows OS to work. There is at least one reputable company that sells high-end scopes (>20k$ and up) that ran on Windows 2000, maybe something more up-to-date now. Fortunately this is not a problem for the lower end devices affordable by people like us or small companies.
I find it hilarious that I could infect my oscilloscope with a virus just by inserting a usb stick to copy some data off it. And I haven't even started bitching about boot up times. Having to run a virus scanner on such a beast naturally doesn't increase speed. The measurement backend isn't affected by that, but anything related to user interaction.
Also I don't oppose running a virus scanner on linux, but currently that's only useful for preventing to spread a virus to the windows pcs out there.