When you purchase a McAfee product and download it via mcafee.com/activate you expect it to scan for viruses and malware. However, due to any reason, it might start giving you glitches and not perform the real-time scanning task that it is ought to do. In that scenario, a user might think it to be a waste of money as well as time to invest in such a product.
Ways to fix the issue:
1. Use McAfee Diagnose and Repair tool
This tool is specifically available on the mcafee.com/activate website to fix issues with whatever McAfee products you are using. You just need to navigate to the official website and download the tool from there. After you have downloaded it, you need to run it on your device so that it could fix real-time issues with your product. After downloading it, do the following:
I. Click on the "Run" option
II. Double-tap on the file
III. Click "Yes" to allow it to make necessary alterations to your device
IV. Be sure that you do not close the windows that open
2. Reboot your system
3. Uninstall any third-party antivirus
Real-Time Scanning is Off...and I can't get it to turn on.
Locate the McShield service and check the status. ...
When the status shows Started, close the Services window.
Open McAfee SecurityCenter and verify that Real-Time Scanning is enabled.
Restart the computer and verify that Real-Time Scanning remains enabled.