I have a Sony Vaio VGN AR21S. It is a European model, which I brought second hand and I was unaware as to the problems of updates if you do not live in Europe.
It is supposed to be running Microsoft Windows Media Centre Edition 2005 as the operating system, but for some reason it has Windows 7 Home Premium on it. All Sony Vaio recovery files have gone, my screen has pink or sometimes green perforated lines running vertical on it. Occasionally, for a very short period, it will clear and be perfect, but alas it always returns.