desktop.your-prize.co.uk is a annoying and malicious popup ad sent by potentially unwanted program (PUP), which is able to serve as an extension or add-on on the browsers, so it could directly recommend itself to you. It asserts to be a helper for your computer. And it will display many ads for the items you are into before you. That is not because it could know you better, but it could monitor your system. So it is unreliable.