I think I've got a virus!

I keep getting advertising pop-ups arriving, even though I have 'Block pop-up windows' selected, and now every time I open Safari, I get a different web-page. I still have the same homepage selected on the Preferences page.
Have I got a virus of some sort, and what can I do??

There are no viruses for Mac OS X, so you don't have one. But it is possible that you have a Trojan Horse which redirects you to different pages other than those you select. You should download and run DNSChanger Removal Tool, which will remove it if you have it. You must restart your Mac to complete the process.
Mulder

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