[lambda_cube]

I don't think it's regional. I'm in Sweden and if I visit the Flash install page with IE I get Chrome as pre-selected and if I visit with Firefox I get the McAfee add-on. (And when I'm using Linux, as usual, there are no extra applications installed.)

[caw]

That's a good catch. The browser thing seems logical. I tried all the permutations I could:

Chrome - McAfee

IE9 - Chrome & Google Toolbar

Firefox - McAfee