What is a Browser Hijack?
A browser hijack redirects, without a user’s permission, an existing home page, search page, or other Web site to some other location. Generally, the intent of such redirection is to artificially inflate traffic to a particular site, expose the user to adverts, or other nefarious purposes. Browser hijacks often behave like, and spread via, spyware.
Sadly, easy to explain and difficult to get rid. You local PC repair man can and if you are in the Tunbridge Wells area so can Redback.