Hi there, I'm using window xp, avast antivirus, window defender, microsoft security essentials, a-squared. I have used above software to remove the Trojan:win32/winwebsec, but it failed. Everytime i restart my computer, window defender will pop out and say Trojan:win32/winwebsec is found and need to be removed, after i click on removed, window defender will show Trojan:win32/winwebsec have been removed. But everytime i restart my computer, window defender will keep showing me the same message. What should i do to remove this Trojan:win32/winwebsec? Lot thanks for your help, vi.