My lenovo wireless keyboard is messed up all the symbols are on the wrong keys, key 2 has the " symbol on it but when I press shift + 2 it gives me the @ symbol and same story for the other keys, i run windows 10
may be you have more than one languages installed.try typing alt+shift and retry to enter the ''.it might be on french in which case the '' sympol is 2 key's left from enter.