I don't know anything about Goback, or how to get your lost info back, but I did have Norton antivirus for the last few years, and when I updated to Norton 2009, my system was completely attacked. I couldn't do hardly anything on my pc anymore, nothing worked right. It wasn't doing it's job, not running scans unless started manually, and it wasn't updating at all. I got a refund, and tried BitDefender, and hated that! It was a total system hog, and wasn't very accurate. I then tried a trial version of AVG Internet Security, and found out that I had 6 Trojan viruses! Neither Norton, or BitDefender picked them up. Luckily, I was able to clear them off of my system, and things seem to be working good now. The only thing I don't like about AVG, is every once in a while, the automatic updating shuts down, and you need to restart your system.
The one thing I learned is that there is no fool proof method of protecting your pc. There are new viruses coming out daily, and you are only safe against the ones your antivirus database is known to protect, which is why it is so important to make sure your updates are being done, and your scans are being run. Also, make a point of deleting your temporary internet files daily, the files that contain tracking cookies.
EDITED TO ADD: AVG can not cure the Trojan virus, it will just detect them to let you know they are there.