Hello, This error comes up on my desktop running Windows 7 x64 Professional. I turn on my computer and it runs for about 1 minute before I get this error message, which restarts my computer. I believe it is microsoft security essentials that is causing this error because it only started happening when I asked it to scan my computer (and it tries scanning every time I turn on my computer). I've downloaded Kapersky Rescue Disc 10 and already ran it and scanned my computer and was able to remove several other viruses, but unfortunately this is still occurring when I turn on my computer. MSE keeps telling me that my computer is infected with Sirefef before it turns off and it can't do anything about the files. Any help would be appreciated. Thanks.