After doing a little Google research, this message seems to be unique to the PC Tools brand of antivirus/protection software.
Are you by any chance using any of the following: Browser Defender, PC Tools Spyware Doctor with AntiVirus, or PC Tools Internet Security to protect your computer?
Also found this link just after posting, which seems to confirm: _http://www.pcmag.com/slideshow_viewer/0,3253,l%253D246201%2526a%253D246138%2526po%253D4,00.asp?p=n
Are you by any chance using any of the following: Browser Defender, PC Tools Spyware Doctor with AntiVirus, or PC Tools Internet Security to protect your computer?
Also found this link just after posting, which seems to confirm: _http://www.pcmag.com/slideshow_viewer/0,3253,l%253D246201%2526a%253D246138%2526po%253D4,00.asp?p=n