Search.newtab-tvsearch.com is a typical home page hijacker. Once installed, it will set the homepage and search engine for any installed browsers to http://Search.newtab-tvsearch.com/ without your permission.
Technically, Search.newtab-tvsearch.com is not regarded as a computer virus. Even though majority of adware behaves like a virus, it was not made to be infectious. In particular, Search.newtab-tvsearch.com does not spread on its own. It needed a carrier like freeware or shareware. Adware authors used to bundle this browser hijacker to other programs and made its installation unseen. While installing freeware, Search.newtab-tvsearch.com also gets installed in the background without taking user’s permission.