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  • Download a copy of Malwarebytes free removal tool from < >, if necessary using another computer to browse to the site for the downloading. Make sure Opera is turned off on the infected system. Copy the Malwarebytes installation file onto the infected computer and install it. Start Malwarebytes and run a system scan - it should find the malware; use Malwarebytes to remove the malware that it finds. Close Malwarebytes and examine the icon you use to start Opera - right click the icon, click Properties, and make sure the command in the Target box does not have a URL tacked onto the end of the command (if it does, remove the URL portion from the command and close the icon Properties box). Start Opera, and things should be sorted out. There are a number of reputable tools that can deal with problems of this kind, and Malwarebytes is one of the best ones.

  • I don't think that the virus is resident on my computer. It only appears when I visit one particular site.

  • How does it look?
    Pop-ups? Redirections?

  • I don't think that the virus is resident on my computer. It only appears when I visit one particular site.

    If it's truly a 'virus', it has to exist somewhere on your computer, by definition. Perhaps your terminology is inaccurate. If it's just a pop-up or screen takeover occurring only at one particular website, it would necessarily be the result of malicious code embedded on that website or within an ad or something similar called up from a 3rd party server by that site's code. A favorite trick is to use malicious JavaScript (perhaps combined with an identifying cookie on the user's system) to paint the screen full of some takeover message that leaves a user baffled about how to remove it and regain access to his system. Alt+F4 is the usual, safe method of killing the current window taking over the screen to reveal the normal screen beneath it, but if it's a repetitively refreshed JavaScript scripting that restores the takeover almost immediately, you may have to instead kill the browser via Ctrl+Alt+Del using the Task Manager to kill the browser processes. Obviously, if the problem is related to a particular site, it ought to be a site for the user to avoid in the future.