Since I gave my dad a Chromebook instead of a Windows machine - I have no problems at all. It is very hard for the tech support scammers to make him install anything on it.
Most malware I've seen in the field is Chrome extensions, so I would not assume this is enough. I recommend disabling browser extensions for maximum computer illiterate IT safety.
And then online banking and your government eID Middleware won't work...
Whoa, there's governments that require browser extensions to work? That's terrifying (but enlightening, thanks).