Hello, today I noticed that Microsoft Security Essentials was disabled (red icon), and I could not get the service to restart even after restarting the computer a few times. I uninstalled MSE and resinstalled it. However, now after every restart of the computer MSE finds the Sirefef virus and displays a message saying Windows found a critical error and must be restarted. I don't seem to be able to install other antivirus/malware software before this auto-restart happens, even in Safe Mode. I am running Windows 7 64-bit. Any help would be greatly appreciated.