Hi there,
About your first question:
a/I think this is linked to the second problem, wait few lines for an answer
b/Try to disable the "Display the cost per unit weight" option System>Configuration>Display
c/In the same panel, select "unit price only" for the "Price display method" option
For the second thing, you have to look at your currency configuration. Go to System>Currency and type your currency name 'NOK'.
Then in the configuration page, look at the format option. Like the helper said:
Format is the way you want to display the symbol (basically you will have %i which will display the currency code as symbol, %n which will display the currency's symbol and %ni which will display both). For more information, you can look at
www.php.net/manual/en/function.money-format.php
So just make it looks like you wanted