Hi Delia,

“Backdoor.Trojan” is a rather generic naming (of Symantec??), so we can’t really say much about that…

Avast will probably detect it, but there’s no warranty…

→ Please read the link" VirusRemoval" below in my sig and then give us some more infos…, e.g.:

  • exact location and name of infected file(s) …: info from your AV’s alert/report/log
  • a hijackthis-Log for diagnosis
  • the version of Windows you’re using
  • maybe results of onlinescans

Then we’ll probably be able to help you, even if you won’t install avast (which of course you could/should… ;D ;D
→ If so however you’d need to uninstall your AV first… ) :wink: