Progressive is currently refusing Non-Windows users from completing the registration process online. This problem is due to bad web design practices-and/or nefarious intentions by Progressive. Seeing this message suggests Progressive has failed to resolve this issue in a timely manor. Continuing to sign-up for Progressive insurance online, by phone, or through another means may also put you at risk of identity theft. Progressive is not following best computing practices and as such is taking risks with your personal information you probably don't want.
If you would like to help fix the problem contact Progressive and inform them that they are currently denying non-MS Windows users from completing the online sign-up process. If Progressive needs assistance in tracking down the problem they may contact ThinkPenguin at 866-703-2989.