This started when I noticed the my Firefox new tabs were opening to Bing. I was able to reset it to the default, but figured some kind of malware that changed it in the first place. When I tried to run malwarebytes my definitions were out of date. I got a warning that the server was unavailable. I continued the scan but it found nothing. Thinking that the malware might be blocking the update I tried booting too safe mode. When I got to the safe mode login it would not accept my usual admin password, saying the user name and password were incorrect. It would then restart on its own. I am able to log into windows using the password/username if I do a normal boot. I did a system restore to a point before all this started. That got me to a point where. Norton did an automatic cleaning that quarantined or removed several trojans a worm and something called SAPE (have a list if that helps). MBAM removed PUP.optional.OpenCandy.
I'm finding that I still can't get into Safe Mode. It won't accept my Admin Password. I've also discovered that if I just let it sit at the safe mode login screen the system will reboot.
I did notice a piece of software called Web Companion from Lavasoft that I don't recognize.
The system is an ASUS CM6820 running Windows 7 - 64 bit, Norton Security Suite 184.108.40.206, Firefox with HitmanPro.Alert
I don't know if I still have a malware infection, or if this is just some configuration issue left over from the infection.