Putrr18.com is a browser redirect virus that seeks to lead you to ad sites. This infection is usually caused by PUP (potentially unwanted program) that comes bundled with other programs. After infiltration, it modifies browser configuration without user permission as well as injects tons of ads.
Search.myquickconverter.com is a deceptive search engine the main feature of which is a quick access to websites that allow converting files. But keep in mind that Search.myquickconverter.com is a browser hijacker capable to affect browsing experience. This malware usually penetrates bundled with other free programs and then sets http://search.myquickconverter.com/ as your default search engine.
The sudden appearance of additional search bar indicates that your computer is infected with malware. This infection spreads through fishing websites or by means of other free programs that you could download from dubious sources. Except that it takes up extra space in the browser, it might also cause browser redirects, generate a bunch of pop-up ads and even spy on your browsing habits.
Startme.online is a highly untrustworthy search site that replaces your default search engine. It crawls into the system without user noticing along with other free programs. This distribution method is called bundling.
Search.hemailloginnow.com is a fake search engine which can appear on your system out of nowhere. It may look like a legit search engine, but, keep in mind that Search.hemailloginnow.com is created to promote advertising content and redirect to ad sites. Once installed, it modifies your homepage, new tab, and search engine as well as provides altered search results.