If, for any of the reasons listed in the Abuse section of this Security site, you are blocked, and you open up your web browser, you may encounter THIS page.
Follow the steps listed on the page, and select agree.
This will take you to the Unblock-agreement page.
Affirming your completion of the appropriate steps on this page will launch the unblocking of your computer. The last screen you will reach is the Unblock screen.
Note: if your homepage tries to route to an 'https' URL, then you will be redirected to an error page.