Computer technician blog
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Viruses - News and articles related to viruses, will be posted in this section.
Windows - How To guides for Windows users.
Mac - How To guides for Mac users.
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"This extension is managed and cannot be removed or disabled" (Google Chrome) - how to remove?
This article describes how to remove a 'managed' Google Chrome extension. Note that recently, there a rise in adware infections, and in many cases, these potentially unwanted programs (PUP) install on users' Internet browsers disguised as legitimate extensions. Commonly, adware is bundled with free software downloaded from the Internet, the installation of which, is often a consequence of not paying close attention to the installation steps. To avoid inadvertent adware or PUP installation, Internet users should always install freeware choosing the 'Custom Installation' option rather than 'Typical Installation' - and be sure to opt-out of any changes to your Internet browser settings. Also, disallow installation of any additional software. In this removal guide I will demonstrate how to remove the SelectionLinks managed Google Chrome extension. I chose this extension simply as an example, however, this removal guide is generic and will help you to remove any managed Chrome extension.
How to create a new user account using Command Prompt?
This tutorial describes how to create a new user account in the Windows operating system using Command Prompt. The guide is helpful when dealing with ransomware or fake antivirus programs that block Safe Mode and Safe Mode with Networking. Cyber criminals responsible for developing malicious programs develop new methods to protect their bogus software from elimination - this includes blocking users' access to Safe Mode.
How to burn and use a rescue CD? A method to remove ransomware from your PC.
The recent outrage of ransomware (screen lockers) has impelled me to write this guide to describe how computer users can boot from a rescue disk. Whilst rescue disks are no longer the most common method to remove spyware and viruses, the recent rise in screen locker infections makes them an effective alternative to unlock your PC. Commonly, rescue disks are used to remove viruses from computers when it is impossible to use Safe Mode. In this guide, I use ImgBurn software to burn the .iso file to a CD.
Today, whilst testing new malware and fake antivirus samples, a 'great' idea occurred to me. Remember that trick when you hit CTRL+A and ENTER on your friend's computer? All programs, files, shortcuts, and everything else on the desktop are executed simultaneously. When this occurs, the only way to return the system to normal is to restart the computer.
The Idea - What if we do the same with many fake antivirus programs?
This was blowing my mind all day, so I finally decided to take the challenge and do the test. I prepared my old Intel P4 computer with 512 MB of RAM, restored it with a fresh install, and checked that it was in perfect working order.
Meet the participants - Fake antiviruses
After spending some time searching for various fake antivirus samples, I selected 14 participants. These were fake antivirus programs that attempt to scare users into buying full versions by displaying bogus warnings and errors. Some were old versions, some more recent. Before starting the test, I scanned all samples with AVG Antivirus Free Edition. One fake antivirus was not detected by AVG, despite ensuring AVG was running with the latest updates.
How to create a System Repair Disc in Windows 7
System Repair Disc is a useful option found in Windows 7, and is valuable in many situations. I believe every PC user should have this disk, since you never know when you might need it. The disk provides several solutions if you are unable to boot your operating system. For example, if your computer is infected with malware, your operating system files could be damaged, and you will just see a black screen when you try to boot your computer. If your operating system does not boot to a state whereby you can see a log-in screen, then it is likely to be a difficult problem to fix. If you have a Repair Disk, however, you can perform a Start-up Repair, and this often fixes the operating system so that you can access your desktop. You could also try performing a System Restore to roll back the configuration of your operating system to a previous state (this option is useful if you have recently installed/updated your hardware drivers and you cannot boot your computer). With the above issues in mind, a System Repair Disk is a very useful asset to have.
How to use Windows 7 and Windows Vista System Restore?
During normal operation, the System Restore feature automatically makes copies of system files and registry entries, thus allowing you to restore your operating system to a previous state. This feature is useful in many situations. For example, Windows Restore is useful if you have installed a program that considerably reduces computer performance and you are unable to uninstall it. In another example, malware, that may perhaps have infected your computer, could damage system files, and in this situation Windows System restore might be invaluable. This feature may also be used if you update/install hardware drivers and your computer subsequently becomes unstable. In summary, Windows System Restore is a useful feature that enables you to roll back to a state prior to experiencing system problems.
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