Search.thesearchguard.com is regarded as a browser hijacker, an infection that will make changes to your browser without authorization. You must have installed some kind of freeware recently, and it likely had the hijacker added to it. Similar threats are why you should pay attention to how software are installed. Redirect viruses are rather low-level threats they do carry out plenty of unwanted activity. Your browser's homepage and new tabs will be set to load the hijacker's promoted page instead of your usual site. Your search engine will also be altered, and it might be capable of inserting sponsored content among the legitimate results. The redirect virus is doing that because it aims to boost traffic for some web pages, and in turn, make money for owners. Do keep in mind that you can be redirected to infected websites, which may result in severe threat. Malicious software would be more harmful so avoid it as much as possible. So that people find them useful, redirect viruses attempt to appear very helpful but the reality is, you can easily replace them with reliable plug-ins which wouldn't reroute you. You should also be aware that some hijackers will track your behavior and gather certain data in order to know what you're more likely to press on. It would not be strange if that info was sold to third-parties too. Therefore, delete Search.thesearchguard.com, before it can affect your machine more seriously.
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