“Insecure Internet activity. Threat of virus attack” is a fake security warning generated by trojan horses (usually Zlob.Trojan or Vundo Trojan) in order to trick you into downloading and purchasing rogue anti-spyware products (such as WinSpywareProtect). Trojan horses will popup this fake warnings every 2-5 minutes. Moreover, thay can hijack your homepage, slow computer perfomance and cause critical system errors. Here is the full message text:

”Insecure Internet activity. Threat of virus attack
Due to insecure Internet browsing your PC can easily get infected with viruses, worms and trojans without your knowledge, and that can lead to system slowdown, freezes and crashes. Also insecure Internet activity can result in revealing your personal information. To get full advanced real-time protection for PC and Internet activity, install an antivirus and antispyware software. We recommend you to protect your PC now and continue safe Internet browsing. Click here to get full advanced real-time protection and continue browsing.
Continue to this website unprotected (not recommended)”

We strongly recomend to remove this annoying security warning and trojan horses from your computer.

“Insecure Internet activity. Threat of virus attack” Message Remover Download

Source: http://malware-remover.com/insecure-internet-activity-threat-of-virus-attack-message-removal-tool/