HijackThis v2.0.5 is very old and no longer updated (to my knowledge), it also doesn’t look deep enough for new malware routes of entry.
This needs further analysis by a malware removal specialist:
Go to this topic http://forum.avast.com/index.php?topic=53253.0 for information on Logs to assist in cleaning malware. Use the information about getting and using the tools and attach the logs there, not in the LOGS topic.
