Just an update for anyone who has this issue again with pcworld newtownabbey:
I emailed the ceo this morning, and posted 3 letters to the relevant department.
Within 1 hours I got a call from the ceo or one of his executives, He confirmed that the pcworld tech team are not fully qualified pc enginners and the build service should never have been offered as they are not trained to do so.
As a result he has advised me to collect the pc from the store, Take it to a 3rd party engineer to get a quote to fix the computer to 100% and he will reimbursh/pay the charges to fix the computer.