Im 99% certain this is a scam- malware type message. Ive had it appear once or twice when trying to access a known website for media. Have a look at the screen shot below.
Once it appears on the screen you cant close the window except by quitting safari completely.
Could my machine be infected with malware? If anyone knows what i should check to make sure im safe.
Thanks

Once it appears on the screen you cant close the window except by quitting safari completely.
Could my machine be infected with malware? If anyone knows what i should check to make sure im safe.
Thanks