I have McAfee Internet security and I have to renew my subscription next month.
I plan to replace it with Avast or Avira Antivirus and use the Windows Firewall which,at the moment is switched off.
I also have Spybot,SuperAntiSpyware,and Malwarebytes' Antimalware on my Dell PC.
Given that my knowledge, of computers, is pretty basic am I likely to have any problems deleting McAfee and do I need the McAfee removal tool for this process? I assume there is one!
As a happy long term user of Avast, I'd happily recommend it. There are probably a large number of users who would also recommend Avira, and quite a few that would recommend MSE, and maybe even a few that would recommend AVG.
Why don't you try each of those you are interested in for, say, two weeks each, have a look at the help forums for each, cross-check the machine from time to time with MBAM, and then settle on the AV you find overall best.