Really? I've used Windows Something or Other since oh, about '94 and have spent hardly any time fixing it. As a % of the time I've spent using it I'd say Windows runs & works perfectly well 99.9% of the time.
I never owned a car that reliable.
Download the updates, they are there for a reason, they don't use much memory, they don't shag your system, not using them is a bigger risk.
This is what we call a no brainer.