Thanks everyone.
Yeah, when I bought this computer I really wanted a Mac, but it was prohibitively expensive!
The thing is, I've already mentioned being careful about what they download and not going to the kind of sites that tend to have malicious stuff. They are agreed, but the knowledge is just not there for them to be 100% safe. That's why I wanted to reign in the permissions a little.
I am going to read up on some of this further, but I still welcome any suggestions.
Thanks again.
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