I have the same problem with the key, except it is not in games. I use the keyboard United States International (Apple) - Parallels It should appear: ` Appears: § Should appear: ~ Appears: ± When pressing Ctrl and pressing twice alt returns to work but after using the tilde key twice, it returns to the problem. Anywhere in Windows. I've already tried reinstalling Parallels Tools. I've already tried removing and then installing. None of the above works.