So i just saw on the wiki that you can fix the Nord hero Bow:

" This weapon cannot be improved at a http://elderscrolls.wikia.com/wiki/Grindstone. This is because the Bow's temper recipe is assigned to the Nord Hero Battleaxe. To fix this, open the Creation Kit, enter TemperWeaponSkyforgeBowin the filter, and select ALL in the dropdown menu. Then open up the TemperWeaponSkyforgeBow and select the NordHeroBow in the Created Object column. Then save the esp file and select it in the startup menu before starting the game."

http://elderscrolls.wikia.com/wiki/Nord_Hero_Bow

But when i search for that in the creation kit, nothing shows up.Any one know why?Or is kind enough to direct to a already made esp file?