Hello, today my Windows 7 64 bit laptop started to receive critical errors after start up and is forced to restart after 60 seconds. I believe it is some sort of Sirefef trojan virus. Windows security essentials is unable to do anything within the short time frame. While restarting the computer in safe mode, the "critical error" still occurs and forces the computer to restart. I managed to turn off all of the start up programs through msconfig, and restarted in safemode. The critical error doesn't appear until I start a scan. Can you please help me remove this?