Asking to install flashplayer even if installed

Sir,

When visit my site, it asking to install adobe flash player in Brazil language (I think so) even if I checked that latest flash player already installed in my firefox plugin. I think that is some malware which asking to install it self behalf of flash player name. Please check if any body can help.

Site : metflowcast.com

Regards,

http://wordpress.org/extend/plugins/better-wp-security/