Microsoft security essentials finds sirefef trojan please help

[kouri420]

Microsoft security essentials detected several sirefef trojans. I tried cleaning my computer using Microsoft security essentials but halfway through the cleansing it started restarting every 60-90 seconds. I used the system configuration in administrative tool to restart the computer in diagnostic start up. I then tried enabling Microsoft security essentials again but as soon as I started it my pc began automatic shutdowns again. so I enabled my internet and found this forum then I followed the instructions in the READ & RUN ME FIRST Malware Removal Guide thread I followed every step to the letter but i'm still having problems I will attach my logs

[TimW]

Please download ComboFix to your desktop and run it. Do not mouse click or do anything while it runs. Attach the log when it is finished.