What does zero day or zero hour attack or threat means? What are its targets? Can a zero day attack be targeted at private or some to large corporation? Can someone be vulnerable through the opening of e-mail attachment? What rigorous security and personal strategy can be implemented to prevent a zero day or zero hour attack? What different vectors are used in zero day attacks?

How do I make my Samsung galaxy S5 smartphone to work properly after the screen gone blank? I have recently installed an app and the app is causing the Samsung s5 to malfunction, I later tried to uninstall the app, but it won’t uninstall thereby leaving me with no option than factory reset which I did. After the reset the phone screen gone blank. What cause the phone to go blank? Is the screen the problem or other hardware?

What prevents my devices from connecting to the home WiFi? I have recently noticed that my devices are no longer connecting to the home WiFi. I have troubleshot the router many times by changing the setting and even upgrading the router firmware, but the devices won’t connect. What can I do to make the devices connect to the Home WiFi?

Why is my Google nexus 9 hanging? I downloaded an app from Google play, while installing the app the shutdown. I restarted the device, but whenever the device finish loading, it always hangs. How do I make the device to stop hanging? Should I report the behavior to the app vendor?

I have an HP Pavilion dv6 that fell from my hands last night and now it turns on but the hard disk is not detected by the laptop. I have lots of important data on the hard drive. Is my hard drive completely damaged? Can I recover my important data? If so, how can I recover the data?

Recently I have been experiencing the problem of someone accessing my Facebook account again and again. I have the mobile code feature on in which you have to enter code from your mobile so the person is not able to open my account. But I have to keep on changing the password and it is very annoying. What can I do to stop this? Does Facebook have any additional security features?

I use Opera to browse the Internet and it works perfectly well. There is a problem with this specific page that does not open on Opera and instead an error appears  that "Secure Connection: fatal error (1066) Unable to complete secure transaction". Is the website I am trying to access secured in some way? Or is it a problem with the browser?

I have an Apple iPhone 5 that has iOS 7 in it. Last night the phone automatically reset itself and wouldn't turn on. I plugged it into the computer and the connect to iTunes screen appeared. I connected it and tried to restore my iPhone but an unknown error 21 occurred. I tried it on different laptops but to no use. How can I fix this? Can I update my iPhone directly?

I have a Sony Xperia T with Android 4.1.2 Jelly Bean running on it. My phone has become really slow lately and I keep on getting the error that Unfortunately "app" has stopped. It keeps on happening with different apps over time. How can I fix this issue? What can I do to make my phone work a little faster?

I have a Dell N series core i3 laptop. It was all good until a couple of days back when a dialog appeared saying your computer has an IP address conflict. Just after that the internet stopped working. I tried rebooting and it worked but again after some time the message appears. Is someone using my IP address? Is it possible? What can I do to stop this?