A used iMac can be found on line if a legitimate search is done. I've seen 3-4 year old Apple products for sale. I think this is an overlooked opportunity.
Consider the time lost, time spent with some Indian guy trying to straighten out your MS laptop.
I am 4 years in with the iMac desktop. No problems. No special protection downloads.
Bulletproof.
Wow, the guy can't afford $20.00 or $30.00 for a program for his computer, so you advise that he buy a new computer, and then repeat the advice when your oversight is mentioned to you?