Installing software from new sources can lead to malicious programs ending up in your computer, and V9.com Portal Site is one of them. It is a browser hijacker, which is installed together with other free programs. V9.com will collect data about your search history, furthermore you’ll be exposed to unwanted advertisements and sponsored links.
The main purpose of V9.com Portal Site is to increase the income from advertising. The best example is website called blackhat SEO, which uses the browser hijacker to improve it’s ranking in search results.