OS 10.12.6

Quite often Mackeeper will appear uninvited asking me to download. Today it appeared and said I had 3 viruses and to remove them I should download Mackeeper.

I have ClamXAV and it didn't find anything. What is the story with Mackeeper and is there a way of preventing it from appearing?

Whilst I'm here, is there any way of allowing folders to be located anywhere on the desktop?

jaybass


OS 13.6.6 iMac (Retina 5K, 27", 2017, 3.4 GHz Intel Core i5, 24 GB RAM, 2400 MHz DDR4. SuperDuper. 1 TB Lacie HD