A viral named QuestDNS111 disguised itself as a F-Fox add-on, and infeted my XP laptop
It appeared on the FireFox add-on list and there it sat until I read about it by doing a search. Windows MS Essentials deleted it - sort of, and I disabled it from the add-on list of FireFox. However, it is sitting my my C drive and won't let me delete it. Since the inception of this problem my computer has been re-directing itself and running about 10-20% normal speed.
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Your issue may be caused by Malware. You can run and update the following free anti virus software:
1. Malwarebytes (Free version) - http://www.malwarebytes.org
2. Spybot Search & Destroy - http://www.safer-networking.org
3.Spyware Terminator - http://www.spywareterminator.com
In addition, there are a number of forums you can use to help get rid of your infection. These include:
What Extensions are you using? Check by going to Tools | Add-ons | Extensions