I know we've drifted onto Chromebooks, which is good, but can I go back to laptops. Windows 10 comes with windows defender antivirus as standard, and very good it is too. The op says he will buy from PC world. Years since I've bought anything at one, but they always tried to flog their own 'preferred' antivirus, promising that the bogeyman would come visit if you did not purchase. Now I'm not suggesting the fat commission had anything to do with this (I lie), but is this still the case with W10 & defender?
Another favorite was extended warranties, again to avoid the dreaded bogeyman knocking at your door. A cynic might say this also had something to do with commissions, but not me

Just a heads up for the op really