[Eric in the Ozarks]

First, ask how old is your computer ?
2-3-4 years old, it might not be capable of moderan updates.

When you shop for a replacement, consider iMac. Bought mine in 2011.
Updates every few months, all free.
Calamity ? Apple has a helper, toll free.
No security system required.

I write freelance articles and take photos for our local paper. My Mac is indefigable.

[hsmomx3]

It’s three years old and I have had no problems whatsoever since installing WIN 10 over a year ago.