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Created a new user profile, changed Windows Display Language to English (USA), sort shows the expected results with "Haakon" above "Helen".
I don't think this is something to be "repaired", since "Å" is supposed to be the last letter in the Norwegian alphabet, and if Excel interprets "aa" as "å", then having "Haakon" below "Helen" is correct. I was wondering if there was a way to turn off this interpretation while still keeping Norwegian as the Windows Display Language.
The behavior is normal, in Germany we have a similar issue where "ß" is the same as "ss". e.g. this data:
Pass
Paß
Pass
Paß
Pass
Paß
is not sorted at all! (BTW, the filter did not work either.)
Close Excel
In your start menu execute intl.cpl to open the regional settings
Click the "Additional settings..." button (near the bottom), maybe you have a "Sort" tab in that window where you can change the sort method to be used.
E.g. for Germany:
Open Excel and test the behavior.
Andreas.