Virus? A pop up window saying the flash player is infected

[MenoMeno]

Hi there I suddenly got a pop up window when I was browsing Facebook. It says

WARNING!

Your video player is infected!

System has two malicious viruses: Rootkit.Sirefef.Spy und Trojan.FakeAV-Download. Your personal and financial information is not secure.

Remove viruses, Please promptly update your video player:

Is this a virus? I am sorry if I asked a stupid question but I am really confused. I am using Mac with google chrome as my browser.

Thanks a lot for your help.

link:http://update3.flash-palys.us/Player/Warning-uk.php?installer=Flash_Player_11_for_Other_Browsers&bro...

[C_F_McBlob]

Well, you can relax... BOTH of the "infections" it lists ( a "Rootkit" and a "Trojan").... WON'T run on a Mac, so you KNOW it's a fake. There's NO WAY it could have detected WIndows malware on a system running OS X.

I'd stay away from that Facebook page, and report it to them.