How to remove PUPs (potentially unwanted applications) and badware.
ScanGuard is bogus security application, that uses unethical methods for distribution and monetization. It is not considered virus, but potentially unwanted application. It looks like modern security program, but does not provide trial version and shows security alerts, demanding payment for removal. In addition to that it installs search.scanguard.com (or ScanGuard Smart Search) as default search engine and homepage in Google Chrome, Mozilla Firefox and Internet Explorer.