my keyboard on my acer aspire laptop misses letters out but only when i am on he internet, it is fine on word or spreadsheets but on the internet it misses out lettes and sometimes the spacebar does not work
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maybe you should try plugging the laptop directly into the modem instead of using a wireless connection, and see if the same problem happens. It may be more of a wireless problem than a computer issue.
Go to Acer site and enter your product info in support most likely all sorts of help there.