I got hit with the System Antivirus a few hours ago. It zoomed past my security software and decimated it. Nothing worked. It disabled every program I had. I couldn't get to Malwarebytes to run a scan. I could, however, get on the internet. How else would they collect my money if I couldn't get on the internet!
Luckily, from reading your site, I had Malwarebytes and RootKill saved to a jump drive which I update on the first every month -- just in case.
I rebooted in Safe Mode, ran Malwarebytes (I had just cleaned my computer on the first, two days ago) and there were 10 new viruses; 3 of which were registry infections. I zapped those, ran RootKill, and here I am! All clean again!
I would have never known what to do if it wasn't for your site.
THANK YOU, THANK YOU, THANK YOU!