Help with Malware?

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So, I use Google Chrome. I've heard of Malware before, but never really experienced it until now. Given that I'm only 14 years of age, I don't understand much about this. Recently, my Google Chrome browser has changed to something called "snap do". I've tried to change my browser back, but in my settings, it already reads that Google Chrome is my default browser. This is a brand new computer and I want to make it last. Can anyone possibly help me? Thank you.