My Windows 7 Home Premium 64 bit on HP 2511x is infected with ICE/FBI ransomeware. I have run Windows Defender Offline. It found JAVA/CVE-2013-0422, and ostensibly fixed it -- but I still got ransom screen. I re-ran Defender, but nothing found this time. Earlier I had gotten boot menu and safe mode (black screen; F12, F8), but could not use restore point or safe mode. Now I cannot even get black screen F8 or F12.