Why am I getting error 404 all of a sudden when viewing pages I use?

I have been viewing the same pages for years looking up crimnal records. Now I get error 404. Microsoft doesn’t seem to help. Any clues? I know I am still using XP home edition, a desktop. Otherwise it works fine. I don’t really want a smartphone, or need one. Any clues? Or is this just a way to force people to upgrade?