I NEED HELP SOON REPORT DUE TOMORROW!!!?

I have a report due tomorrow but when i try to fix something in the middle of the sentence on the computer it will erase the next letter. It is really hard to explain i don't know any better way to explain it but if you know what im talking about and you can help please tell me how to fix it as soon as... show more I have a report due tomorrow but when i try to fix something in the middle of the sentence on the computer it will erase the next letter. It is really hard to explain i don't know any better way to explain it but if you know what im talking about and you can help please tell me how to fix it as soon as possible. Thank you.
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