I got a really weird email from a friend on Facebook: it was just a Web site URL and when I went to it, I got a warning message that it was an "unsafe" and that it'd been blocked. What the heck? What's going on?...

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I'm really wanting to get into the field of hacking. It's something I've always wanted to do. It seems, however, that whenever the question of "how do I learn to hack" is asked, it is usually responded to with the over-used statement "Teach yourself." I know that hacking is a skill that is built over time, and I'm well aware that it cannot simply be taught. Still, there has to be some form of advice...

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I was using Skype the other day on my PC and suddenly Windows Security Center popped up a warning message telling me that my computer was infected by a virus and that I needed to install a repair utility of some sort. Huh? What's that all about, Dave?...

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Hi, I went on craigslist.com and saw that they were giving away a pool table. I emailed the guy and asked for some pictures and he sent me an email back saying that he had posted them on his blog and put the web address in there. I clicked on the address and it said that I had to install something to see the pictures, I did not, but I really wanted to see the...

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Is it possible for someone to access sites when i'm online ? Sites have appeared in the history of my mothers computer that i was using but did not access. As you can imagine these weren't particularly desirable sites.It also mentioned about inserting a disk something else i just didn't do. Is it possible to hack somehow whilst i'm online ? at the time i was using google and visiting sites such as myspace and...

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Hey bro! I'm staying at a campground and when I connect to the wireless network, I get a warning that there are all these other computers connected from my PC-cillin program, and it asks me if I should trust them or not. What does it mean?...

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Dave, there are a bunch of new comments on my MySpace profile that link to "msplinks.com", even though they look like they're from different people. Is this some sort of unified attack on my profile or what?...

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If you hop from PC to PC, do you really trust that they don't have spyware, malware or viruses installed, hiding in the operating system? What if you could carry a cheap little keychain pendant that not only offered you storage, but also included effective, easy-to-use anti-virus and anti-spyware applications with which you can quickly scan that suspicious PC and make sure it really is safe for you to use? These devices are just coming...

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My wife found an email from my spam box in my gmail account that was a reply from an email that was sent from my email address. The problem is I never wrote the email. The address reply is my email address! I have never seen the address before in my life and the message that was sent from my email address is not even anything I can understand. This is very odd. What's going...

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In the past 3 days I've received dozens of returned e-mails that appear to be sent by my domain name but that are not valid email addresses. For example I received a returned e-mail today that was "sent" from nvsnx@mydomainname.com but there is no user "nvsnx". Where did this come from, how do I stop it, and what risk am I at from this happening?...

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I've been getting plugged into the world of Firefox, and man, it rocks. I really like it, and I especially like that there's a huge library of different extensions that can make Firefox just about jump through flaming hoops. As I keep adding more and more, however, I'm starting to worry about whether it's possible that some of these extensions are actually spyware or viruses. Is that even possible? And if so, how do I...

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I've become increasingly paranoid in the last few years and have long since lost any sense of innocence or even optimism regarding email. I trust noone and am leery of using any Web-based email service, but I have been exploring Google's Gmail service. My question to you: if someone emails me a virus will Gmail even recognize it, or do I just see it as a regular attachment? Also, how does Gmail filter spam out,...

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