Virus warning

It is not a virus, just an annoying popup. Force quit Safari, then restart Safari while holding the Shift key.

1. No.

2. They're not warning you. They're trying to scam you.

3. You don't.

4. See #2.

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These sites are scams. Ignore and move on. Do not click anything on the site or call any phone numbers. It is unlikely you have any problems on the computer.

In the event you have a problem exiting the page:

Helpful Links Regarding Malware Problems

If you are having an immediate problem with ads popping up see The Safe Mac » Adware Removal Guide and AdwareMedic.

Open Safari, select Preferences from the Safari menu. Click on Extensions icon in the toolbar. Disable all Extensions. If this stops your problem, then re-enable them one by one until the problem returns. Now remove that extension as it is causing the problem.

The following comes from user stevejobsfan0123. I have made minor changes to adapt to this presentation.

Fix Some Browser Pop-ups That Take Over Safari.

Common pop-ups include a message saying the government has seized your computer and you must pay to have it released (often called "Moneypak"), or a phony message saying that your computer has been infected, and you need to call a tech support number (sometimes claiming to be Apple) to get it resolved. First, understand that these pop-ups are not caused by a virus and your computer has not been affected. This "hijack" is limited to your web browser. Also understand that these messages are scams, so do not pay any money, call the listed number, or provide any personal information. This article will outline the solution to dismiss the pop-up.

Quit Safari

Usually, these pop-ups will not go away by either clicking "OK" or "Cancel." Furthermore, several menus in the menu bar may become disabled and show in gray, including the option to quit Safari. You will likely have to force quit Safari. To do this, press Command + option + esc, select Safari, and press Force Quit.

Relaunch Safari

If you relaunch Safari, the page will reopen. To prevent this from happening, hold down the 'Shift' key while opening Safari. This will prevent windows from the last time Safari was running from reopening.

This will not work in all cases. The shift key must be held at the right time, and in some cases, even if done correctly, the window reappears. In these circumstances, after force quitting Safari, turn off Wi-Fi or disconnect Ethernet, depending on how you connect to the Internet. Then relaunch Safari normally. It will try to reload the malicious webpage, but without a connection, it won't be able to. Navigate away from that page by entering a different URL, i.e. www.apple.com, and trying to load it. Now you can reconnect to the Internet, and the page you entered will appear rather than the malicious one.

In the event that there's actual malware on the computer, you won't get a warning like that. You'll need to determine it for yourself, either by noticing unusual behavior or manually using a scanner.

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Please see item 2 from Niel above.

Because scripts on the webpage made your browser display the message. Many people do what the message says and that is the problem.

Typically if you get a virus nothing shows up like the that message. Most of the time the bad guys to not want to advertise that they installed a virus. Many times you will get malware/adware that pop ups sites to try to get you to go to their sites.

http://www.thesafemac.com/arg/

Because, this is the real http://www.thesafemac.com

1. The site Illass linked to was created by a longtime contributor to these boards. It's safe to visit but isn't run by Apple.

2. If that popup was the only unusual thing you got, there isn't any malware on your computer.

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The real site would not pop up notices in your browser nor ask you to call a phone number. That's why.

It is the real site

No. It is not Apple.