Malware affecting various applications on MacBook Pro

Malware has affected my MacBook Pro. I am having problems with Mail, Apple Music, and Safari, at the very least. I think this was connected with my download of a bogus Adobe Flash Player, which contained something called Mac Cleaner Pro. I have since excised the latter from my system, but problems persist. Safari works fine for a while, but then freezes up. No websites will load. All of my mail accounts carry the exclamation point in triangle: cannot reach server. And messages cannot be sent: several messages sit in my OUTBOX for over a week now. Apple music will not play content from Apple Music. At first it would not play anything, until I followed instructions for a fix online to change the DNS. Now my own content will play, but nothing from Apple Music will. Anyone else experiencing such problems?