and when I perform this tweak:
Click start and type CMD, select icon, right click, run as administrator
In prompt type these commands:
1) DISM /Online /Add-Package /PackagePath

path to your language pack)
example -> DISM /Online /Add-Package /PackagePath:C:\languagepack\sv-se\lp.cab
This can take quite a while
2) bcdedit /set {current} locale sv-se (or whatever language)
3) bcdboot %WinDir% /l sv-se (or whatever)
4) regedit
open HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MUI\UIlanguages
remove the key en-us
Will this give any conflicts with windows update? I don't want my OS to be half dutch - half english
Thanks for the reply btw