Could you please explainhow I can remove the following search engine from my Firefox search page please
First, try to reset Firefox. Refresh Firefox - reset add-ons and settings. This simple step will eliminate many Firefox problems with only one click.
Download and Install MalwareBytes Anti-Malware, run a full Scan. http://www.malwarebytes.org/. This helps check that there are no viruses on your computer causing issues. You can uninstall this program after you clean off any infections.
Also, installing https://addons.mozilla.org/en-US/firefox/addon/searchreset/
You may also want to go into your Add and Remove programs, and uninstall anything related to Conduit.