How do you know there is a virus in the computer?

Computer virus is a terrible thing, it can even control your computer to steal your personal information, so how to identify the virus in the computer? I'll tell you how to distinguish computer poisoning.

The first way to identify computer poisoning is that if the computer frequently appears strange sounds, pictures or prompt messages, as well as abnormal error messages or garbled codes, your system may have been poisoned.

If the capacity of system memory or hard disk suddenly drops sharply. A program that has been executed before, when executed again, suddenly tells you that the memory is not enough.

The computer suddenly became dull, unresponsive, blue screen and even crashed.

If the size of the executable file changes, it is probably a virus.

The indicator light on the hard disk is always on for no reason, indicating that the computer may be poisoned.