If you do not uninstall McAfee before installing a newer or another product version, it will create software conflicts and slow down the computer. You may also encounter windows crashing and sluggish behavior. Hence, you need to follow the correct procedure on how to uninstall McAfee from your PC.
Steps to Uninstall McAfee computer:
Click on “Start” and open “Control Panel”
Click Programs option in the Control Panel
The option may vary as per your Windows OS version
On the next page, click Programs and Features
Select un install a program
From the program directory, click-right on ” McAfee” icon
Click on Uninstall/ Change option
Click the “Yes” if asked -“Are you sure, you want to completely remove McAfee, and proceed
Restart your computer
See McAfee window opening up when you turn on the computer, the software is not completely uninstalled yet and may need a virtual technician for complete un-installation
Web-source https://www.mcafeetechnicalsupportnumber.com/uninstall-mcafee-antivirus-from-mac