There is a computer club here in the villages that take old PCs (win 7 or newer) and scrub the drive before reinstalling Windows 10 on it.
I suggest loading Linux Mint which will wipe out the drive and make an old PC feel like new. I've converted several people here in The Villages and, so far, none have asked to go back to Windows.
Linux Mint is free, it's like Windows without all the problems. Generally, you don't need virus protection because of the way Linux works. You are very unlikely to get a virus or ransomware.
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