Computer viruses and other kinds of malware are very common. While corrupt data on your computer can make it unstable, sometimes malware replicates itself until it fills up all available space on the hard drive of the system, turning a computer into a brick. Here's a quick guide to detect the nasty viruses:
Sudden Slowdown
If your computer has been attacked by malware and viruses, it will boot up slowly. Viruses have the tendency to slow down the operating system. You will notice slow processing of internet or files while transferring them from your computer.
Look at modem lights
If no programs are running on your computer and the modem is constantly blinking, a virus may be transmitting data over the network.
Popups from nowhere
If you have a virus in operating system, you may start seeing random messages appear on the computer screen, even if no other programs are running. These can include advertisements, error messages, and more. Virus can sometimes change the wallpaper of your system without permission. If it happens, chances are a virus is infecting your computer system.
Granting programs access to firewall
If you get constant messages about a program requesting access to your firewall, it may be infected. You get these messages as the infected program is attempting to send data through your router.
False security programs
Sometimes you find a security program you never installed running on your computer. Security program often get installed as you click on random links, accepting their terms.
Wrong sites
If you are doing a Google search and it goes to a different browser, the system is virus infected. Normally, traffic redirection means an unwanted software has been installed. It can exist in the form of an extension to the browser. One can resolve the problem by clearing browser cache and uninstalling extensions.
You will find shortcut files
If you suspect shortcut files on your desktop or drives, there are chances the computer is infected with shortcut virus.
Enormous internet traffic
Sometimes depending on the type of virus or malware on your PC, chances are it can use your bandwidth to download data and files to the machine without your consent. So if the internet is slow, check your security program to detect unwanted files. You can also scan the traffic and connection routing.