My computer is unresponsive to `~ key, the left of 1 key. Windows just doesn't accept the input. Nothing is responding to it.
The computer is running Windows 7 64bit. I am using English (US keyboard) input. This is not hardware or keyboard problem. When I switch to another input language, the key "works" and shows up a different character.
I know you said it was not a hardware problem, but have you tried a different keyboard?