Like so many have already posted, I too have the Sirefef virus on my wife's PC. I need assistance on removing this dreaded virus. Her machine is 64 bit and was running Microsoft Live Essentials. After booting the PC, it will run for about 60 sec then reboot over and over. I have to actually power off the machine as the shutdown does not work either. I ran the suggested FRST64.exe and have attached the text file it created. Any assistance would be greatly appreciated.