Well, at least one of them: Internet Explorer 6.
Some interesting (depressing) stats: Worldwide, 12% of the world is still using IE6, as of Feb 2011.
However, one advanced nation is down to 2.9%, and leads the world on this measure of intelligence. USA! USA! USA!
(Except for Germany (2.9%), Portugal (2.4%), and the Czech Republic (1.4%), which don't count, because they're Old Europe. Oh, and except for Brazil (2.9%), Colombia (2.8%), Denmark (1.6%), Sweden (1.3%), Norway (0.7%), and Finland (0.7%), which also don't count, because socialism.)
YOU FORGOT POLAND.
Oh, yeah. 1.4%.
In all seriousness, if you're still using IE6, your machine is almost certainly pwned, and is likely part of a botnet, helping to send out spam and to do other nasty things, without your knowledge. So please. Be a good netizen and stop using IE6.