If the characters, I type are different than what they are supposed to be what should I do?

[Fox Lavender]

When I type the characters they are different than what they are supposed to be. If I type a question mark something else comes up. I had to guess which was which. I looked it up on the internet which told me to run a troubleshooter on the keyboard. I did but nothing wrong was found. How can I fix this?

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