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Computer malware authors exploit weaknesses in software. Developers combat computer crooks by patching their programs to block malware attacks. That's why we're encouraged to keep our software up-to-date. Every now and then, a software update fails, leaving our systems a little less secure.

I got a first-hand look at the problem the other day when the Apple Software Update program balked at installing iTunes version 11.0.3 on my Windows 7 PC. The installer reported "insufficient privileges" and suggested I log on as an administrator or contact my system administrator. Of course, I was logged … Read more

Apple's Preview program is the default PDF viewer in OS X, and has a number of options for annotating and otherwise managing PDF files. One of its features is support for Quartz filters, which can be applied to PDFs and image files to convert them, for example into sepia, black-and-white, or gray scale. A Quartz filter can be used to reduce the PDF's file size, but while it's effective at doing so, you may find images in the resulting PDF too grainy to use.

These compression routines are done by adjusting the embedded image quality of the … Read more

In recent years, we've seen people dabble in bringing a narrative film experience to mobile phones. It makes sense -- there's an interactive personal screen in your pocket that allows you to pick up content wherever you go. But neither the interactive film "Tender Loving Care" (starring John Hurt) nor the Dutch film "App," which interacted with your iOS or Android device during cinematic screenings, picked up much traction.

"Haunting Melissa," by film producer Neal Edelstein, might have what it takes. Available globally as a free app on iOS, the film is accessible, and it's using the flexibility of mobile devices to experiment with the genre. … Read more

After a rough night out on the town, looking at your Foursquare history is a good way to figure out where you were (assuming you were coherent enough to use your phone). Sometimes you may not like what you see and want to delete any trace of where you were as fast as possible.

Or you could have innocently checked into the wrong venue and need to delete the error from your history.

Well, you can delete any check-ins directly from your Android or iOS device. I'm not sure when the feature was added to either app, but previously … Read more

SAN FRANCISCO -- Google's expensive Chromebook giveaway here at its I/O 2013 conference can't handle connecting to digital cameras, but that's just one of many problems the laptop causes for its owners.

Chromebooks, which run Chrome OS (read review), are a perpetual work in progress. Updated every six weeks or thereabouts, just like the browser they're based on, Chromebooks rely on the promise of the modern Web.

But getting browsers to talk to commonplace hardware like USB ports, Webcams, and microphones is no easy task. Web Real-Time Communication (WebRTC), a plugin-free way to stream video, … Read more

MacFixIt Answers is a feature in which I answer Mac-related questions e-mailed in by our readers.

This week, readers wrote in with questions on the locations of the various libraries in OS X, the options for using an old internal hard drive from a MacBook as an external hard drive, and the options for managing Wi-Fi networks that span greater distances than their radios can cover.

I welcome contributions from readers, so if you have any suggestions or alternative approaches to these problems, please post them in the comments!

Question: The location of various libraries in OS X MacFixIt reader &… Read more

When Apple releases Mac firmware updates, the system undergoes a special installation procedure in which it shows a progress bar on a gray screen and then reboots. If you have an update available but do not see the progress bar when applying it, it may not have installed properly. As such, you may see the update still showing in Apple's Software Update service.

There are some special requirements for handling firmware updates as opposed to standard software updates, and if they are not met, the system may fail to install the update.

The first requirement is to ensure that … Read more

I love a good magazine. That's why I'm hoping digital distribution services like Next Issue and Zinio can help usher in the age of the digital periodical.

Yesterday, Zinio gave it a little nudge by unveiling Z-Pass, a sort of a la carte subscription option: three magazines for $5 per month.

According to the Zinio press release, "The monthly cost of a Z-Pass is the lowest available in the market for a multiple-magazine subscription model." That's technically true, but with a huge asterisk: Next Issue (a sort of Netflix for magazines) costs $9.99 per … Read more

The U.S. Defense Information Systems Agency (DISA) has approved the use of Apple iOS 6 devices on the Defense Department's networks, the agency said in a statement Friday.

That means the DOD can provide iPhones and iPads running iOS 6 to its employees, though employees cannot use their own devices on the military network, a DISA spokeswoman told CNET.

"It doesn't mean [Apple is] getting a contract with us or anything like that,&… Read more