I purchased a brand new Acer Spin 1 laptop in Thailand, so the keyboard also has Thai characters on it. I have no idea what I pressed but today when I am trying to type, the characters are in Thai, not english.
Go to the "Start" menu, then choose "Settings," "Control Panel" and "Regional and Language Options."
Click the "Languages" tab, then the "Details" button, the "Settings" tab and the "Add" button.
Choose an input language from the list. You can choose ANY language. For example, if English (US) is the "input language," check the "Keyboard layout/IME" box to select the US-International English keyboard from the list. Click "OK" and close the input window.
A language indicator should appear in the System Tray (the area in the bottom right hand corner of the desktop).