anoyed trojan! I was surfing last night when my browser prompt me one window, immediately followed is something like voice broadcast began to anoy me. My ituite told me that it must be some kind virus. So I have to stop to scan the memory for virus, within several minites, some trojan was detected and was reported that it damaged my system file. Then I rebooted my computer and did full scan for the drive, checked security settings on my computer, the user account & group policy, the windows firewall, the shared resources, the security patches, after almost one hour's work, finally, the trojan was cleared completely.

But there is one thing that I confused, how I got  my computer infected? I checked my browser history and found no clue.