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If you've checked for rogue search-engine add-ons and other undesirable browser extensions, and you've run a "crap cleaner" to rid your system of temporary files and other bloat, and it's made little to no difference, it may be time to think about infection detection and removal.There's plenty of advice out there suggesting that your first move should be to go online and run a scan using one of the many free tools available from OS and antivirus vendors.While this appears to be common sense – after all, you need to know what you've been infected with in order to remove it effectively – the truth is that malware has evolved to the point where an active internet connection is the last thing you should do during a potential live infection.Besides, it's likely that some malware will block the best-known security vendor sites, as well as those offering the tools to scan for and remove infections, making going online a waste of time. Err on the side of caution as far as internet connectivity is concerned and simply pull the plug on your router to prevent further data compromise.

If you do have an antivirus scanner running, but malware is running on your system, assume that the software has been compromised: it could be that the malware has managed to disable updates or prevent it from loading properly.Whatever the situation, you'd be silly to trust the scanner during the malware identification and removal process.Regular PC Pro readers will be aware from our Labs tests and reviews that no security suite or antivirus scanner is perfect, and none can detect every malware threat.Combining two or three free tools will serve you better: run one, follow any removal recommendations, then – once the system has rebooted – do the same with the next antivirus tool, and so on.At the end of this process, if all three show a clean system, you should be able to get on with your life. I have a licensed copy of Malwarebytes Anti-Malware (MBAM) sitting on a USB thumbdrive for such an emergency situation, but a free version that features all the necessary malware-removal functionality is available for non-commercial use; all it's missing compared to the Pro version is real-time prevention and priority updates.

And yet another user said: "When I started using the laptop at the end of last week I thought I smelt something odd. Well... here I am Sunday doing some work on the couch and my wife says 'what stinks like cat pee?'. I said: I think it's this laptop."Others reported that the laptop was "unusable with the stench" and expressed concerns about the safety of the equipment. The problem doesn't affect all 6430u laptops, with forum posters reporting that only some devices are afflicted with the unsavoury odour.One Dell moderator repeatedly suggested taking the laptops back to where it was purchased or cleaning the keyboard with compressed air, but eventually another Dell technical consultant - going by SteveB on the forums - admitted the company was gathering up affected laptops to test. Dell today said it's figured out the root of the problem, caused by a "manufacturing process which has now been changed" - the company stressed the cause wasn't urine or any other biological material. Any of the laptops bought now shouldn't smell, Dell said."For everyone who currently has an E6430u affected by the issue, it's going to require replacement of a part but we must make completely sure that we have sufficient stock for everyone and also that any parts we are sending out do not also have the same issue," SteveB said. "We are working on this now and everyone involved completely understands the urgency. We appreciate everyone's patience."

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One user didn't let the issue lie, and suggested Dell might do well with "scented computers" - but with nicer aromas. SteveB said he'd forward the suggestion to Dell's engineers.Dell suggested the problem was in the palm rest assembly, and said anyone needing a replacement can contact technical support on 0844 338 1200 or at Dell's support website.Powerful. Light. Long-lasting. Pick two. That’s the kind of choice that faces an R&D department every time it puts pen to drawing board. With the Yoga 3 Pro, however, Lenovo decided it didn’t want to compromise: this £1,300 hybrid harvests the first crop of Intel’s long-awaited Core M processors to form the thinnest, lightest 13.3in hybrid money can buy.Lenovo has pared its hybrid to a mere sliver: it measures 13.8mm thick, and even the small rubber feet on its underside only swell that measurement to a slender 15.2mm. It’s light, too, the metal and plastic construction tipping the scales at a svelte 1.19kg. This isn’t a record-breaking figure – although Sony has since departed the laptop market, its featherweight VAIO Pro 13 weighed a mere 1.05kg – but Lenovo hasn’t compromised on build quality. The Yoga 3 Pro feels surprisingly resilient given its dainty build, and it’s only once you make a concerted effort to twist it out of shape that the taut chassis flexes and springs back into place.

It isn’t unpleasant to look at, either: the chassis is sandwiched between panels of metal that curl delicately towards the edges, the chassis tapers gently from the rear to the front edge, and a pronounced lip of grippy rubber echoes the book-like styling of the previous Yoga generations. By far the most ostentatious feature of the Yoga 3 Pro, however, is the “watchband”-style hinge at the rear. This combines strips of solid metal links with six intertwined, multilayered chains, which join the display and keyboard together – Lenovo says it’s formed from more than 800 separate parts.Amazingly, Lenovo hasn’t had to throw out all of the connectivity in the redesign. There are three USB 3 ports (ingeniously, one doubles as the mains charging port) a mini-HDMI output, a 4-in-1 memory card reader (full-sized SD, MMC, SDXC and SDHX are supported) and a 3.5mm audio jack. There are also physical volume buttons and an orientation lock along the right-hand edge, and 802.11ac and Bluetooth 4 also make the grade.

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In everyday use, the Yoga 3 Pro’s newly trim figure makes all the difference. Its predecessor the Yoga 2 Pro weighed only 200g more, but that hybrid’s thicker, heavier chassis made for a device that was palpably less wieldy in tablet mode. By comparison, we found ourselves using the Yoga 3 Pro far more regularly as a giant-sized tablet. It’s large but not unpleasantly so, and the combination of the grippy rubber keyboard surround, light weight and thinness make it far less of a handful.Crucially, the Yoga 3 Pro still makes for a pretty good laptop. The watchband hinge holds the display firmly through every one of its 360 degrees of movement; the rubberised keyboard surround and chassis’ soft, rounded edges are a perfect pairing with the responsive, crisp-feeling Scrabble-tile keyboard; and the compact touchpad below works without fuss. Meanwhile, the touchscreen above responds to every pinch, flick and edge-swipe – this is a luxurious-feeling, high-quality hybrid.

It’s not all great news, however. For instance, we can easily pick fault with other aspects of the keyboard: the loss of dedicated function keys seems an odd choice on a “pro” laptop, and the decision to push the Page Up, Page Down and Delete buttons along a row on the right-hand edge (and right next to the Enter and Backspace keys) means the layout takes some getting used to. Until you acclimatise to those eccentricities, you can expect to spend your first moments with the Yoga 3 Pro regularly hitting the wrong keys.The Yoga 3 Pro’s stick-thin chassis owes much to Intel’s Core M processor. As the first production model we’ve seen from Intel’s 14nm CPU family, the Core M-5Y70 has a weight of expectation resting on it.It’s the fastest of the three-strong family of current Core M processors, with two cores running at base-clock frequency of 1.1GHz, which doesn’t sound all that impressive. During single-threaded applications, however, Turbo Boost takes the CPU up to a far quicker 2.6GHz – that’s doubly impressive given that the Core M is capable of working within a TDP of only 6W, not much more than a humble Bay Trail Atom CPU. http://www.batteries-pc.com/lenovo.html http://www.batteries-pc.com/lenovo.html

UPDATE 27/10/2014: Contrary to our initial findings, further testing has revealed that the Yoga 3 Pro doesn't take advantage of the Core M-5Y70's fanless potential: closer inspection with a Torx screwdriver has revealed that there's actually a tiny low-profile 25mm fan hidden within.Indeed, in the course of our original testing we hadn't heard a peep from the Yoga 3 Pro's slender chassis, but firing up Prime95 to thrash the CPU flat-out soon sent the Lenovo's tiny fan whirring quietly into action. And it really is quiet: even in PC Pro's calm, peaceful office space, we had to press our ear to the right-hand of the Yoga 3 Pro's hinge before we could hear a delicate whoosh of air coming from a tiny vent hidden behind the watchband hinge.

Sadly, though, the Yoga 3 Pro's petite fan and heatpipe arrangement doesn't do a very good job of keeping the Core M cool. Hit both CPU cores hard, and within seconds the core temperatures soar up to 83C - at this point the clockspeed plummets from 2.6GHz down to 1.3GHz, and even though the temperatures flatten out at around 65C, the CPU begins to throttle back to 1GHz. This, sadly, means that raw performance suffers, at least compared to Haswell-based Core i5 and Core i7 Ultrabooks. In our Real World Benchmarks, the Yoga 3 Pro scored an underwhelming 0.45, or 35% less than the 1.6GHZ Core i5-4200U in the Lenovo Yoga 2 Pro.

It’s 28% off the pace in the Media encoding part of those tests and 40% slower in the Multitasking tests. It doesn’t feel slow subjectively – the CPU's ability to deliver quick bursts of power, as well as a 256GB SSD and 8GB of RAM, make sure of that – and the component scores in our benchmarks bear out that experience. Indeed, the Core M drops only 8% behind the Yoga 2 Pro’s Haswell Core i5 in the Responsiveness portion of our benchmarks, but once you really pick up the pace and start hammering the Core M with multithreaded applications, performance really starts to suffer.The appearance of a new graphics chipset, the Intel HD Graphics 5300, does little to spice up gaming performance. In our Crysis benchmark, run at 1,366 x 768 resolution and Low quality settings, the Yoga 3 Pro limped to an average frame rate of 26fps – it should come as no surprise to anyone to discover this isn’t a lightweight gaming laptop.


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