I’ve been repairing pc since 1985 time and time again I find 97 problems being viruses or malware.
There are so many fake web site like (you tube video) that will load bad code into your pc and make it hard to run games or cause them to crash. I’ve had people with brand new pc crash them within an hour going to fake web sites.
There are bad people out there and gamer hacks that will love to crash your stuff.
Remember there are no free lunches!

you tube ---is a real site.
you tube video--- is fake site will load bad code into pc .

+1
This is absolutely true.
This post needs more views

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The only way as I know to prevent this is security software
Kaspersky
Identifies suspicious websites and phishing websites
Advanced anti-phishing technologies proactively detect fraudulent URLs and use real-time information from the cloud, to help ensure you’re not tricked into disclosing your valuable data to phishing websites. Our URL Advisor also adds colour-coded tags to all web links – to advise you of the danger level of the link and subsequent pages.

Prevents malware from exploiting vulnerabilities in your PC

If your PC has application or system vulnerabilities that haven’t been updated with the latest fixes, cyber criminals and malware could gain entry. In addition to scanning for vulnerabilities, Kaspersky Internet Security 2013 anolyses and controls the actions of programs that have vulnerabilities – so they can’t cause any harm.