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

I can't use Google search results right now. The actual searches return results that look valid, but whenever I click on a link, I'm redirected to strange sites. I believe I'm being affected by a virus that has something to do with the string "otnggrneohai."

I was running Windows 7 Home with Microsoft Security Essentials, but Microsoft Security Essentials has been deleted. I did not delete it myself.

Here is the screen shot, I did a search test in google videos:

Image

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marked as duplicate by BloodPhilia, studiohack Mar 14 '11 at 23:48

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.

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I think it's you falling asleep on your keyboard. What is the context for this? Where did you see it? –  Majenko Mar 14 '11 at 17:40
    
when i searching in google returns true results after that when i click on every link first redirect me to strange sites . –  shaahin Mar 14 '11 at 17:51
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Strange. When I search on google all I get is Superuser.com and your question. –  Majenko Mar 14 '11 at 18:06
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Where do you see otnggrneohai? Is it the name of a file that appeared on the desktop? The contents of a popup window? A new user account on the machine? Give us some more context, please! –  Pops Mar 14 '11 at 18:28
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This might indeed be a malware attack then. The domain isn't registered though –  Pekka 웃 Mar 14 '11 at 18:54

2 Answers 2

up vote 1 down vote accepted

You must have malware.

Install and update some AV software and run a full scan. Uninstall and reinstall Firefox. Run Spybot Search & Destroy.

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Although this is a useful answer, we have a community wiki to describe how to perform a disinfection. Please feel free to add your own method or edit the answers already given to suit your method. Please refer the OP of questions about disinfection to this community wiki and close to vote as a duplicate if you can and if it is appropriate. –  BloodPhilia Mar 14 '11 at 23:04
    
Noted. Thank you! –  goblinbox Mar 15 '11 at 1:45

I would suggest that unless you have a compelling reason not to you should BACK UP YOUR DATA, reformat your hard drive (or buy a new one) and then reinstall Windows and all your applications. If antivirus vendors don't know about whatever malware this is, you'll have a very hard time removing it without the reinstall.

The alternative would be to call Microsoft support (since you're using their antivirus/antimalware protection) and try to get them to help you diagnose and fix the problem. Since you aren't a major corporate customer or MVP, don't hold your breath while waiting for them to get back to you.

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2  
Buy a new hard drive? Because of a virus? No. –  nhinkle Mar 14 '11 at 19:44
    
New hard drives cost less than, say, two tanks of gas for a mid-size car these days. No, I wouldn't tend to do it, but I'm comfortable with low-level formatting. –  CarlF Mar 14 '11 at 20:29
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Right, but the existing hard drive costs as much as nothing, becuase he already has it. If somebody isn't comfortable with reformatting their drive, they probably won't be any more comfortable with replacing it. –  nhinkle Mar 14 '11 at 20:31

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