For most people the available free antivirus, spyware etc is fine
Many open source software programs are available which are suitable for most people
Software for PCs is cheap compared to Mac
Virtually all software (Free and paid for) will work on a PC, whereas it’s limited for a Mac
If you want to update a piece of hardware the Mac costs you an arm and a leg, whereas PC hardware is cheap off the shelf
If you do have a problem it is easy to find someone who can help you with a PC, not so with a Mac
A PC is most likely used at work so there is no learning curve at home
There are also many other advantages of a PC
Taking the above into account, the Mac is just a very expensive style item

Bill