Rob,
when rebooting using the delete key to enter setup
Can you explain why you need to press the delete key on boot? Is that something you do each time on start up?
Does the computer boot to the desktop, and you then get the password box?
Does pressing the Escape key, Alt F4, or any key, remove the password box?
Sounds like this is a variation of the Virus scanner software scam to relieve people of their credit card details.