Why will getting a Mac fix it? I’d prefer not to have a 40 year old OS.
Technically, you're right... getting a Mac wouldn't fix any of the numerous Windows vulnerabilities, including the one this Freeper has suffered. Getting a Mac would have prevented it in the first place, however, since they're essentially immune from all types of malware, including viruses.
What 40 year old OS are you referring to? Windows XP? I knew it was old and becoming obsolete; I didn't think it was 40 years old, however.