Search dot us dot com is a search page that probably got access to your PC when you installed a freeware via any installer from a freeware website. It will add a search box and a search start page in your PC internet explorer, Firefox, Chrome. Anytime when you open new internet browser, start page with ‘start.search.us.com’ will be opened. This is a browser hijacker which will display advertisements and sponsored links in your search results, and may collect search terms from your search queries. Here is how to remove it.