If you like you Windows 7 in Nynorsk (Norwegian) then download the latest Language Interface Pack (LIP) now.

Click here to download the Norwegian (Nynorsk) Windows 7 LIP

Please note that we are releasing a 32- and 64-bit version of the Norwegian (Nynorsk) Windows 7 LIP. This LIP can be installed only on a system that runs an Norwegian (Bokmål) version of Windows 7.

and if you are still running  Windows Vista try the Vista version

Rob