Virus prevents antivirus updating
This is exactly how Rombertik propagated last year.
Often they hitch a ride into our system on the back of a different program. The affected file might be a software tool, or even a document.Computer viruses can fill up your computer’s usable space, slowing everything down to a halt.Or delete important files in such a way that they can be lost forever.Viruses can be transmitted by downloading programs from other sites or be present on a diskette.You may be unaware that you have received a virus and may be spreading it as a virus can be dormant until something causes its code to be executed by the computer.
Anti-virus software is a program or set of programs that are designed to prevent, search for, detect, and remove software viruses, and other malicious software like worms, trojans, adware, and more.