Not an Isolated incident.
No surprise, PCWorld don't like admitting anything and replacing their faulty goods even less.
I had the same response when I tried to get a replacement on a 2 month old laptop that had gone faulty (Dead pixels, Intermittent Power failure, Mains adapter socket not always registering it had been connected to charge, fscked keyboard..... i.e all hardware related)
Initially as I had linux on I was told that they don't deal with "Alien Software". Asked them if it was really made by aliens as that would be worth a fortune. And got told that ANY SOFTWARE INSTALLED invalidates their warranty.
One Arguement in store and a visit to Trading Standards made no difference whatsoever...... PCWorld refused to budge. A quick call to Head office for their legal department and a half hour arguement over the Sales Of Goods Act and I managed to get a replacement the next day. After resetting it with the VISTA CD of course.
It shouldn't be this hard to get faulty hardware replaced, it should be checked INSTORE and sorted within a day or two.
Strangely they have now put up signs saying 28 day refund or it gets repaired, which is still against SOGA.