AVG found a trojan, BackDoor.HackArmy.2.c, and I used TrojanHunter to remove it. Now it was found in winxpupdate.exe. Should I replace this file, or can I keep it and run Windows Update safely? And if I need to replace it, if I run Windows Update will it be replaced by the Microsoft website? Thanks for a great site and a good resouorce for we of the unwashed masses who know little about this stuff.