WindowMix Malware Affecting Macs — WindowMix, which is annoying browser hijacking malware, is affecting Macintosh computers.
Most Mac users who find it on their machine do not remember how it got into their system.
This site explains how to remove it. It recommends also using the utility software Combo Cleaner which requires purchasing a subscription to use its anti-virus service.
We f0und, however, Combo Cleaner to be unnecessary in solving the problem and its reviews are not very good.