FWIW, I've serviced a good half-dozen machines in the past year that were infected with one variant of AntiVirus XP or another. I've used several top-rated cleaning and removal products including the one from Malwarebytes that claims to be a specialist in removing this infection.
All of the machines required a complete reload of the OS, either clean install or using the OEM system recovery media, because various glitches and dysfunction remained. This thing is nasty and will leave the system state damaged or dysfunctional even after it is gone.
I'm sure I could have spent another whole day pin-pointing exactly which system files or registry keys were damaged/corrupt, but frankly had no interest in doing so.
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