AV rogue malware;
http://www.bleepingcomputer.com/virus-removal/remove-av-antispyware
Those are commonly installed via a 'drive by' download, which are served up through malicious 3rd party 'advertising', which most people allow through their browser: either IE or Firefox**.
Don't let these parasites into your system in the first place.
Browser "hardening" is now a "must do" end user operation, as 'Net born malware is rampant & ceaseless.
Get Firefox as your default browser & use it for everyday surfing; fall back to IE only for "last resort" viewing of substandard websites & Windows updates.
The following tips help, but methods (vectors) constantly change.
FIREFOX: Tools> Options> Privacy> top drop menu set to "Firefox will use custom settings..."> Check 'Accept Cookies from sites'
►& Un-Check 'Accept 3rd Party cookies'
My own choices (from Mozilla) to bolster Firefox is here:
https://addons.mozilla.org/en-US/firefox/collection/dunbarpappy
(►►At least get the #1 item for malware prevention: NoScript, which prevents these 'drive by' and many other exploits)
iE does not have this kind of blocking. Use at your own risk.