Hi rosyposy.
I used to have a security program,not McAphee,but something on the same lines.It cost me around £40 pounds a year.I found it would slow down my computer quite a bit,so I got rid of it. Now I depend on "MicroSofts" own security prog` I have also got installed a prog` called: SUPERantispyware,which is very good.You can find it on:
http://www.superantispyware.com
The version I have is free,but you can buy versions as you wish.The main thing about this prog` is that it does not slow down the computer. Give it a try-----could save you money.
keenonhist
P.s As for windows 8---sorry can`t help I`ve got Vista.