<p>PC sales continue to decline after the launch of Windows 8. This surely means it's underperformed - but has it?</p><p>The famous bald dome glistened under the stage lights as, dressed casually in an open-necked shirt and a red jumper, Steve Ballmer played the proud dad.</p><p>He declared the release "a rising tide that has helped lift all boats", and he wasn't exaggerating: sales of PCs were up 50% on Black Friday, helping to make it "the best-selling OS in history," installed on 4% of computers in less than three weeks. Ballmer can come across as smug, but on this occasion he had good reason.</p><p>Alas, the reason was Windows 7 and the occasion CES 2010, occurring only months after critics had showered positive reviews on the new arrival.</p><p><a href="http://www.pcpro.co.uk/features/381109/is-windows-8-to-blame-for-pc-sales-slump">Keep reading...</a></p>