I should begin by saying I'm paranoid about security, going so far as to use a separate user account in Win 7 from the administrator account, keeping everything up to date, occasionally going through and just poking around the system to see if anything's amiss, etc. I'd like to think I know what I'm doing when it comes to being cautious about malware, so this one was pretty sneaky. I started getting backdoor.bot warnings in the MB dialog box, so I started looking into this. I ran both MBAM and MBAR and they both come up clean. Avast never warned me of anything. So I rebooted, and there were no more MB warnings. However, I then found out that there was a program running called SearchIndexer.exe, but instead of saying "Windows search provider" or whatever, it was showing up with a description of "klkjzvjkawetoinkbf" (not that, but something similar, with all random letters). So then I ran AdwCleaner and it found an extension in Chrome with that same name, plus a registry key that may have also been related, and let it remove those. I still have Windows Update access, Windows Firewall was still on, and I never lost internet access. But I decided to install ZoneAlarm because it alerts you to PUP trying to get outbound, and WF doesn't. So I have a few questions... 1) I don't remember allowing this extension to be installed. Is there some way it might have installed itself without my approval? i2) If #1 is "yes", Is there something else besides MBAM resident that I an install to prevent this from infecting me in the first place? 3) What else should I run to ensure I'm infection-free? Thanks in advance.