Moved into Home User Assistance. Another fake AV, things are getting busy.
Can you stop the payment?
That said follow
Ignore the ad at the top all this is free.
Mcafee and other like products do not detect fake Avs and this type of product well as it is usually the user who allows it access we mods are discussing this issue with Mcafee. You did the right thing but probably lost teh $89 .Put in a complaint to the bank you never know.
Pity your mother jumped the gun there are several registration numbers that can be used and then the PC is free to be cleaned.