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"Windows 8.1 was the tech news on everyone&amp;#039;s lips this week. The operating system was officially unveiled at Microsoft&amp;#039;s Build 2013 event, after which a preview download was made available. The Start Button return was confirmed following wide speculation, as well as improved customisation and the ability to boot-to-desktop for those wanting to avoid the Start Screen. Sticking with operating systems, Apple&amp;#039;s iOS 7 remained in the headlines this week too. Reports suggested that the forthcoming update could include some head-movement features to access the home screen, launch apps, and adjust the volume. Meanwhile, iOS rival Android suffered an increase in malware applications. Research by a security firm found that some 276,259 malicious apps are now in circulation. Finally, Sony showed the power of its 4k Ultra HD technology at Wimbledon this week. Tennis star Anne Keothavong had microscopic adverts placed on her fingernails and shoelaces to show the detail its new TVs are able to achieve. To see all the biggest tech stories of week, check out our gallery below:  "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/tech/news/a493896/the-weeks-biggest-tech-news-in-pictures-windows-81-ios-7-head-movement/>