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Scan for and remove ransomwares
Considered to be the worst computer virus, ransomware is a type of malware that restricts the users' access to the computer and forces the users to pay a "ransom" to the operators of the malware in order to remove the restriction. Although very rare to get, it can sometimes cause data loss (you will have to reinstall Windows, and the "C:" drive will be wiped). It can also prevent you from accessing Windows, encrypt files so you can't use them, stop certain software from running (e.g the web browser) make you complete surveys and etc.
Viruses are designed to deprive you of the pleasure to browse the net and download files quickly and nowadays it is difficult to tell which is the worst computer virus. The solution is to remove them; however, there are some viruses which may incapacitate your antivirus and prevent it from operating normally. If you try reinstalling it or install a different one, the result will be the same.
If you wonder how to get rid of a virus on your computer, you need to access the safe mode (so that the virus remains inactive). If don't know how to get into Safe Mode, check the don't know how to boot in Safe Mode guide to find out.
Download a fresh copy of an antivirus software and scan your computer. Since the virus (or viruses) is inactive, it will be easier for the antivirus to delete it. *If you are not sure which antivirus software to download and install, check out the don't know which antivirus software to install solutions.
Run a full malware scan with Malwarebytes Anti-Malware followed by SFC /SCANNOW command in CMD (open the start menu and type cmd in the search box, right-click on it and Run as Administrator, and type SFC /SCANNOW in the window) to repair any system file damage the malware has done.
Scan for and remove zombie/bot malware infections
A botnet is a network consisting of hacked computers that are infected by malware and controlled by the botnet owner without the computer owner’s consent and knowledge.
The bots can be used to launch DDoS attacks that can cause a website to go offline, send spam messages, drive fake traffic, click advertisements and much more, depending on the botnet owner. Normally the user won’t even notice that their computer is a zombie bot being controlled because the malware is programmed to stay hidden as long as possible, by bypassing both known antivirus or firewall software and does not damage nor change any part of the operating system that may trigger the owner’s suspicion.
The best way to remove a Zombie/Bot malware infection is through Safe Mode. To get into Safe Mode:
If you use Windows versions other than Windows 8(.1)/10: Restart your computer and press F8 (or F12) before the Windows logo appears; *If you use Windows 8(.1)/10: hold the SHIFT key and click Restart at the login screen.
Once the Advanced boot screen appears highlight Safe mode with Networking out of the offered options and press Enter on your keyboard (if you are not sure how, read this);
If you wonder how to get rid of a computer virus, or a virus on your mobile device, the answer is simple - install an antivirus. A good antivirus software is essential, if you want to keep your personal data and files (pictures, videos, documents, etc.) to yourself. If you don't have an antivirus software installed, make sure to install one as quick as possible.
Scan for viruses in Safe Mode / Safe Boot (Mac)
Viruses are designed to deprive you of the pleasure to browse the net and download files quickly. The solution is to remove them; however, there are some viruses which may incapacitate your antivirus and prevent it from operating normally. If you try reinstalling it or install a different one, the result will be the same.
In a situation like this, you need to access the safe mode or safe boot (so that the virus remains inactive). If you are not sure how to get into safe mode, click don't know how to boot in Safe Mode guide.
Once you are in safe mode, download a fresh copy of an antivirus software and scan your computer. Since the virus (or viruses) is inactive it will be easier for the antivirus to delete it (them). Also, you can run a full malware scan with Malwarebytes' Anti-Malware to make sure that the virus(es) is(are) removed.