raman
2
hm, write down the filename of that Backdoor and start your PC in safe mode. You should be able to delete/rename it then. Search the Registy for that filename, and delete the references to the file.
You could send the file to avast, so they can add it. To Avoid a false alarm youcan test the file here: http://www.kaspersky.com/remoteviruschk.html