Real time scanning off well can be a corrupted install, another AV installed or you have a virus/malware that is conflicting with mcfee.
Usually 1 of the following will fix it
It has most suggestions
Another 1 posted by a user is
Posted by Gerryhiles
Next time it happens to you try this: check the warning flag in bottom right hand corner and see if it is red. If so then click on it and you'll be given a list and be able to turn on Windows Defender. That'sit.
If issue still persists, please contact technical support chat from this link http://service.mcafee.com/TechSupportHome.aspx?lc=1033&sg=TS and they will remote in for further diagnosis
2 Re old interface you should install from your account that will give you the latest versions also before you do that remove all bits of the old mcafee via
reboot and install from your account
re 3 wrong forum to ask what to use instaed of Mcaffe
I would run getsusp HERE. to see if it sees anything amiss
Thank you so much Tony for your prompt, helpful and good natured reply - I really appreciate it.
Marking this discussion as 'Assumed Answered' and locking it. As it is over 6 years old.