Hi Leon,
What Ronson said - lock down that PC and your browser. That will keep almost all of the crap out.
One browser to consider is 'Brave'. It's based on the Chromium source code but has all of the Google telemetry stuff ripped out and additional ad-blocking, privacy & security features added in. Combined with 'NoScript' it's as secure as you're going to get.
Cheers,
V
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