PickMySearch will supposedly enhance your search and browsing experience. But be wary because this potentially unwanted extension has been found to be a browser hijacker that will attempt to commandeer your browser search and homepage. Search results will send you to malicious websites to get money from you or infect your computer further. It may also show unwanted advertisements and prevent you from changing your settings back.
PickMySearch is usually installed through bundled software without you knowing. Remove it immediately.