Google's ReCAPTCHA service (aka I am not a robot) was introduced to stop automated attacks against weakness in Virgin Media's sign in process and for this reason it is unlikely to disappear anytime soon.
If appropriate try the audio challenge instead by clicking
The image showed the ReCAPTCHA test had been passed so that is not the issue and unfortunately instead of a meaningful error message Virgin Media chose to simply re-prompt. As a consequence of re-prompting Google's ReCAPTCHA service will soon start to prompt for solutions because the behaviour is deemed automated.
The problem is that either your sign in details are incorrect or Virgin Media are failing to authenticated correctly; the likelihood it is the latter which will required a phone call to Virgin Media for resolution.