That’s not what it says. It says if you are infected, you MIGHT not be able to get in.
I went to one of the links and got the following good news:
If you are reading this page, your computer is probably not infected with Conficker as the worm blocks access to most security web sites. If you have a computer that is infected, you will need to use an uninfected computer to download a specialized Conficker removal tool from. The tool is available here.