This is a good one. How necessary are Anti-Virus? If I'm only downloading things from reputable companies, and not going on any suspicious sites is that really something I need?
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Yes. Get an anti-virus software. I use malwarebytes. Not too long ago malware was introduced through the windows program itself but was caught by anti-virus softwares. I'm pretty sure it only applied to non-updated Windows programs, but still you should have an anti-virus software downloaded.
Also, Windows requires you to update Windows, unlike with Mac. I recommend (though I don't do this myself) updating Windows fairly soon after it pops up saying there's an update, otherwise a few weeks after continuing to ignore the update your computer will force update when you turn it on, or while you're in the middle of something. That's my biggest issue with Windows is the force updates.