Virus in computers is a malicious software commonly known as malware that tends to steal information, destroy the computer and also delete files. 

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Knowing whether your computer has contacted virus or not is not something that just happens automatically.

There are key things that one has to look out for in order to know that the computer has a virus. 

Here are some of the signs that can help you know that your computer has a virus;

1. Slow start-up and slow performance

If all of a sudden your computer starts its program slowly and the speed of performers also lowers, the first thing to do is to confirm the RAM space of your computer. If the RAM space is okay, then that automatically signifies that the slow performance might be caused by the virus present in your computer.

2. Missing files

Some malware usually delete files in the computer. For that reason, if you keep losing your personal files then know that they are being 'eaten' by a virus in the computer.

3. Crashes and error messages

If programs in your computer start opening and closing themselves automatically, followed by weird error messages then know that your computer has a virus.