Hi,It appears that I have been infected by sirefef.fc. I am an intermediate level computer user, but I have almost no experience in this field. All I can establish is that this trojan has burrowed itself in my system files and locked itself insde, safe from my AV programs. Nod keeps bugging me to delete it, but it can't and Malwarebytes doesn't delete it either. I also tried using RougeKiller as suggested on the Malwarebytes forum, to no avail. Any help would be much appreciated. Thanks in advance.