McAfee is easy to use, for most computers. Occasionally antivirus programs, including McAfee, can cause certain other programs not to work properly. I, personally, have never had a problem with this.
I started using McAfee many years ago after my computer was infected with the "I Love You" virus. I was new to the Net at the time and wasn't aware that my computer could be infected with a computer virus with the simple act of opening an email attachment. People are always sending emails with attachments. They are usually jokes or funny images.
Now when I receive an email from a friend that has an attachment in it, but there is no reference to the attachment in the email itself I will sometimes email my friend asking them if they meant to send an attachment.
If I decide that I don't need to do this because I feel the attachment is safe I really don't have to worry because I am using McAfee. I know Mcafee will catch and computer virus that may be lurking in my emails.