Please do try these troubleshooting steps that may help in solving the issue.
- Start by checking if your keyboard layout is set to United States.
- Here's how to: http://acer.custhelp.com/app/answers/detail/a_id/37408/~/windows-10%3A-changing-keyboard-layout
- If this will not work uninstall/reinstall the keyboard driver.
- Open Device Manager, right click on the keyboard driver and select Uninstall.
- Reboot your laptop once uninstalled and it should reinstall the driver automatically upon reboot.
- Do test it again after the reboot and see if the problem has been resolved.
- If it doesn't work connect and external USB keyboard then test it and see if it will work normally or not.
- If it does work that could mean that the built in keyboard was damaged.
- Your last option if it works normally using an external keyboard is to do a factory reset.