The Greatest PC Mysteries--Solved!

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Ever had a video refuse to play on your laptop? Had Windows ask if you wanted to enable something called "Sticky Keys? Or suddenly found a bunch of unwanted toolbars appear in your browser? If you're like most PC users, these situations will likely sound familiar--and probably quite perplexing. But don't despair. We know why these mysterious events occur, and how to respond when they do. To get the lowdown, read "The Greatest PC Mysteries--Solved!" You may never be mystified by persistent PC beeps or obscure error messages again. --Editorial Director Steve Fox Top Stories The Greatest PC Mysteries--Solved! PCWorld's editors band together to solve the greatest PC mysteries! Find out why your PC beeps on startup, what a .dat file is, how USB 2.0 and USB 3.0 differ, and much more! Puppet Masters of the Internet When these ten guys pull the power strings of the Internet, everyone jumps. Free Antivirus You Can Trust Can a free download really protect your PC? Yes, but you have to choose the right one. Our lab tests identify the most reliable no-cost security programs. For more security reviews and news, visit PCWorld.com. Top Tweets From @PCWPluggedIn Microsoft taking a closer look at "racy" apps on Marketplace: What a coincidence. So are the people buying them. Linux-based "Vivaldi" tablet is almost ready: We're hoping it will come with a four-season warranty. Facebook begins organ donor initiative: If someone "likes" your kidneys on Facebook, it's time to start worrying. Follow us every day on Twitter: @PCWPluggedIn News Tech Movie Guide for 2012 The season technically kicks off this week, so check out the superheroes, vampires, secret agents and more that will invade movie theaters this summer. How a Non-Tablet Changed the Tablet Market Amazon's Kindle Fire is so capable, so packed with features, and so cheap that no tablet but iPad can compete. What Makes a Good Password? Sound advice against the use of bad passwords has been around for decades. Yet I still find people electing to use passwords like pa55w0rd and login123 as if they'd never heard about password-cracking programs. For the latest reports, visit our News page . PCW Business Center RIM Focuses on Future with BlackBerry 10 RIM seems optimistic that BlackBerry 10 will give it an edge and help it regain its lost mojo. Visit the PCW Business Center. Blogs Panasonic's Newest TV Prototype Is Too Big for Your Living Room If you want Panasonic's new 145-inch HDTV, you may need to think about getting a bigger house. Facebook 'Likes' Could Get You Fired, and Legal Options are a Challenge Several plaintiffs found out the hard way that their Facebook activity is not necessarily protected speech. 10 Fantastic Websites You Need Now From tips for shopping or gambling to business and travel resources and reality checks while browsing, here is a roundup of great sites that are largely under the radar (until now). For the latest news and opinion, visit our Blogs page . Reviews Twitter Tools: 11 Free Apps and Services You Need Now Looking to get more out of the world's most popular microblogging service? Here are 11 free apps that deliver the goods. First Look: ZoneAlarm Free Antivirus + Firewall Launches Today ZoneAlarm's first free antivirus/firewall suite makes its debut. PCWorld examines its features. Compare prices on security software. For more reviews, visit PCWorld.com. How-To How Switching to VoIP Can Save You Money Migrating your business to a Voice-over-IP communications system may save you a big chunk of change in the long run. Here's why (and how) to cut the phone line and go VoIP-only. Choosing the Right Shutter Speed Here's how to pick the right shutter speed for every photographic situation. For more tips, visit PCWorld.com. Downloads Microsoft Security Essentials Microsoft's free utility fights viruses and other malware, and does a surprisingly good job of it. For more free and trial software, visit PCWorld.com. PC World Community Does System Repair Disk Wipe Out the Whole Hard Disk? Join the discussion. Visit the PC World Community Speed Matters Learn how to boost your PC's security without losing speed. Learn more here. Advertisement Lenovo ThinkPads & IdeaPads Click thru to shop the bestselling ThinkPads & IdeaPads! Most Popular Searches Android Windows 8 Tablet Downloads Antivirus Product Reviews Dell Precision M6600 90 Pros Superb display with two types of touch interfaces; Excellent keyboard and pointing devices Cons Price can ramp up quickly ; It's Hulk Hogan huge Read Complete Review » Top Desktop Replacement Laptops » 100 Best Products of 2011 » Barnes & Noble Nook Simple Touch With GlowLight 88 Pros Built-in LED light for reading in the dark; Responsive touchscreen interface; Easy-to-hold, lightweight design Cons Physical page-turn buttons are still too stiff Read Complete Review » Top E-Readers » HTC One S 88 Pros High-end camera with lots of shooting modes; Thin, premium design; Excellent for gaming and multimedia Cons No microSD slot; Mediocre call quality Read Complete Review » Top 10 Cell Phones » Top 10 Android Phones » Get Big Savings When you Shop at PCWorld.com Shop online at PCWorld.com, where you can compare product information, read trusted reviews, and find the best prices on consumer electronics. Officejet Pro 8100 N811A Inkjet Printer - Color - Plain Paper Print - Desktop Price: $84.95 No User Ratings Yet Be the first to review Deskjet 3050A All-in-One Inkjet Printer Price: $79.97 No User Ratings Yet Be the first to review Browse more Best Prices on Printers, Ink & Toner, Paper, Graphics & Publishing Software Top News on PCWorld.com $99 Subsidized Xbox 360 Would Widen Battle for Living Room Microsoft's rumored deal is expected to be offered at the company's retail stores as early as next week. Share: Samsung Galaxy S III vs. iPhone 4S vs. HTC One X: Spec Smackdown Here's how the new Samsung Galaxy S III stacks up against its competitors from Apple, HTC, Nokia, and Google. Share: Top Reviews on PCWorld.com TechHive: Should You Buy That New Laptop, or Wait? If you think you want a new laptop this year, this quick guide can help you decide when you break out your credit card. Share: TechHive: Three-Minute Tech--Aperture and Shutter Controls If your camera has manual exposure controls, learning the basics of aperture and shutter adjustments can help you reclaim some photographer creativity. Share: Free Antivirus You Can Trust Can a free download really protect your PC? Yes, but you have to choose the right one. Our lab tests identify the most reliable no-cost security programs. Share: Ink-onomics: Can You Save Money By Spending More on Your Printer? Should you buy a lower-priced printer whose inks cost more per page, or a higher-priced printer that uses more-economical supplies? Our printer comparison calculator will help you decide. Share: Downloads: Editor's Collection Twitter Tools: 11 Apps and Services You Need Now Twitter is all about keeping things brief. After all, the micro-blogging service limits you to 140 characters per post. But the market for twitter apps and services is huge. Everywhere you turn, there's a desktop app aimed at organizing your social media life or a search engine claiming to be the next best way of culling the tweets you want to read. Of course, not all of these apps are equal, but we've found 11 that manage to (mostly) improve upon your Twitter experience. Browse DownloadsAntivirus & Security • Design & Multimedia • Utilities • Games • Chat, Email, & the Web • Sponsored Downloads ExtraFTPAn FTP (File Transfer Protocol) client which allows you to transfer files between your local computer and a server on the Internet. With its many basic and advanced Features ExtraFTP also offers secure, reliable and efficient transfers that make it a powerful tool. (Compatibility: Windows 95/98/ME, NT/2000, XP, Vista.) PCWorld newsletter subscribers, use discount code EXTR-YBE5 for 50% off! TwelveKeys Music Transcription AssistantAn aid to assist musicians in learning and transcribing music recordings. 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