If you have more then one language installed on your computer, sometimes the active language changes, seemingly by itself. It takes a restart to go back to the original default language. In the meantime, you will see different characters appearing with many keys you use.
What happens and how do you solve it?
If you click the right ALT key plus the left SHIFT key simultaneously, the active language changes. If you want to change it back, try hitting this key combination again.
Or, if you don't want this key combination to change languages in the first place, go to your control panel, choose languages or country settings. On the Advanced keyboard settings tab, you can disable the shortcut.
