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Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
It sounds as if your computer might need security software: an anti-virus, and a firewall or Internet Security program also.
Does it currently have those? if not, I can advise you how to get adequate software that is free and has few or no drawbacks (i.e. respectable established-name security software).
As for the model #... to get the user guide, we would have to know the model first.
Models for an Asus laptop/notebook, are found on the label on the underside. The print may be very fine and hard to read without a strong light and/or a magnifier.