New
#11
Yeah, no wonder.
Which of his downloaded movies or games is he willing to sacrifice?
I'd delete something sizable that I could replace at little or no cost and see if the machine will then boot.
He may not even know where stuff he downloads is stored, but it's likely somewhere under his C:\users\his-user-name-whatever-it-is directory if he just uses defaults.
Does he acknowledge that his hard drive cannot store an infinite number of items?
Will he entertain the notion that he may have to either buy a new hard drive or start deleting stuff?
He could always get an external drive.
I assume he has no interest in backing up any of this and is willing to lose it all when his hard drive fails, as they all do---possibly not in his lifetime, given "elderly".