like an idiot, I bought the Personal Antivirus software for $89. their icon appeared on my desktop.
Oh dear! Personal Antivirus is a rogue and as such i suggest you contact all bank/credit card companies and report that you may be a victim of ID theft.
If you do any banking or other financial transactions on the PC or if it should contain any other sensitive information, please get to a known clean computer and change all passwords where applicable, and it would be wise to contact those same financial institutions to apprise them of your situation.
Please read this: How Do I Handle Possible Identify Theft, Internet Fraud and CC Fraud?
I called Personal Antivirus, and they told me that I was now protected by them and I should disregard the McAfee warnings and probably remove McAfee.
I am surprised they answered the phone, you may want to report them to the FBI.
Please download Malwarebytes AntiMalware.
Install, update and run a scan. Let Malwarebytes remove what it finds.
Run a online scan with this vendor to check that there are no infections present.
If all comes back clean, or any infections found are removed, follow instructions in link below to uninstall/reinstall Mcafee.