Scam Pop Up Windows.
Occasionally, a browser window may pop up with a scam message. 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 or Microsoft) 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. Most of these scammers, if you actually call the number, will ask you to install software giving them remote control over your computer. Do not do this either.
In addition to the FBI scam, there are a few webpages with bogus technical support pop-ups or "security alerts," claiming you have a virus as described earlier. These webpages include but are not limited to:
Be vigilant and call for help to remove it.