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What to do if my computer is infected by a virus or a malware?

Every time I change the Home page in Firefox or IE it returns back to ?

What is wrong with my PC? Is it a Trojan or spyware?

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marked as duplicate by slhck, Daniel Beck, Nifle, Sathya Sep 27 '11 at 15:16

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

See my post here to clean it… – Moab Sep 26 '11 at 15:45
Follow the steps in the post linked by Moab (not only his answer, but generally all the advices there). If you don't succeed, report back. – slhck Sep 26 '11 at 16:12

Yes it's the result of a trojan. There is a post here that might be of use. Basically you may be able to remove it with something like MalwareBytes. Unfortunately if the problem returns or you are unable to run MalwareBytes then there could be an underlying rootkit in which case you'll need something like rootrepeal. Did you have any anti-virus software installed before this happened?

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Yes, I have Symantec Endpoint before the problem. I'll try the MalwareBytes. – Nour Sabouny Sep 26 '11 at 16:50

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