An annoying pop-up

Hello, Catherine.

This seems to be a browser hijacker. Please check the list of installed programs on your PC and uninstall Scanguard if it is installed. I would also request you to reset your web browser to default settings.

How do I get rid of this:
http://www.unprotectedcomputer.com/connection-not-secure/?source=503_68_BOCV4_3026&uip=1351093944&ucn=United%20States
It pops up all the time when I click on any page.

Hello, Catherine.

This seems to be a browser hijacker. Please check the list of installed programs on your PC and uninstall Scanguard if it is installed. I would also request you to reset your web browser to default settings.