Windows Defender comes bundled with Windows 10 which provides anti-virus protection and that should ok as a Mcafee replacement.
For info,
uninstall Mcafee via:-
- Right-Click (as opposed to the usual Left-click!) on 'Windows Start' button
- Select 'Control Panel'
- Select 'Uninstall a program'
- Locate and select Mcafee from the list of Applications displayed and select Uninstall. (you may need to reboot your system when complete)
Next, to check / ensure Windows Defender is running:-
- Left-click on 'Windows start' button and select 'Settings'
- Select the menu item 'Update & security'
- Select 'Windows Defender'
- Under the item 'Real-time protection' you should see a small Blue button with a White dot and it will either have the status showing as 'On' of 'Off'. If you see showing as 'On' then Windows Defender is already activated. If it is showing as 'Off' then click the blue button and it should change the status to on.
Windows Defender will automatically update itself on a regular basis.