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(NECN: Ted McEnroe) - Software upgrades are good, right? Not when the bad guys are making them. That's the dilemma for security experts after the creators of Conficker, a worm that allows hackers to take control of your computer and use it as part of a botnet for spam, <a href="http://news.cnet.com/8301-1009_3-10170280-83.html?tag=mncol;posts">rewrote their program</a> after the good guys figured out how to disable the first version. Conficker has made it onto an estimated 12 million computers. The good news - there is no sign that anyone infected with the older worm (which can be blocked) is automatically exposed to the new one. The bad news? The new worm can't be disabled in the same way as the old one. Microsoft has offered a <a href="http://www.nytimes.com/2009/02/24/science/24computer.html">$250,000 reward</a> if they can catch those responsible for Conficker. And Facebook users have a new bit of malware to worry about. <a href="http://www.sophos.com/blogs/gc/g/2009/02/23/beware-error-check-system-facebook-application/">Blogger Graham Cluely at Sophos warns</a> about the application "Error Check System", which is offered as a download along with the message to users that some of their friends can't read their profiles. Cluely says the program is apparently a scam to recruit users and potentially steal information, and it also can take you to a website where you can download a fake antivirus software package that is actually a piece of malware. Just another reminder that Facebook does not vet their third-party application developers - counting on people to forget that just because it's on Facebook doesn't mean it's OK. And lastly, the new Kindle is out and <a href="http://www.nytimes.com/2009/02/24/technology/personaltech/24pogue.html">getting good reviews, including this one from David Pogue</a>, but is there a copyright fight coming? The 'read aloud' feature gives you a computerized voice reading your book for you, which could cause problems for some authors and publishers in an industry where authors often sign book contracts with one company and audiobook contracts with another. Edward Baig of USA Today is among the many folks noting the issue, <a href="http://www.usatoday.com/tech/products/2009-02-24-kindle-latest_N.htm?csp=34">which could come to a head later</a> as the voice simulation software improves. For now, it might not be a big threat to audiobooks. As Pogue notes, the Kindle reads Hemingway with the same computer intonations as Stephen Colbert.