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First make sure you have no other Security Applications installed, to include Windows Defender if your OS is Windows 10. It unlike prior OS has Anti-Virus Capabilities as well. Kindly follow these Guidelines/Instructions to properly do a Clean install. How To Uninstall/Reinstall McAfee Consumer Products EXCEPT Anti-Theft
If you still have issues, you can of course contact Technical Support 24/7 at no cost: https://service.mcafee.com/webcenter/portal/cp/home/contact Online Chat\Phone being the most expedient.
All the best,