Sometimes things like this happen, you lose some money but just move on. Maybe to Norton or Bit defender.
Suck it up!
if you need a good Fire wall Use Norton - I didn't want too. but I gave in and got a credit card and signed up for Norton, If you need to control software access with out command lines, it will work for you.
If you live near a big city you can go to a big box store, Best Buy or even Office Depot and buy them on sale (hopefully)
Ask yourself is all this trouble worth the $80 dollars you spent on mcafee - the answer is it it ain't.
Spend another 80 and it should work - and if it doesn't you can switch back and forth between them (on different hard drives)
OH! - don't think mcafee will give you a refund! Hahahahahahahah.