RegSetValueEx error

I'm trying to write data to the registry using this function and it keeps returning error code 1450 (insufficient resources). Anyone know what would cause this?

My function looks like:

Public Function SaveSetting(ByVal Section as String, ByVal Key As String, ByVal Setting as String) as Boolean

   Dim nRet as Long
   Dim hKey as Long
   Dim nResult as Long
   
   nRet = RegCreateKeyEx(HKEY_CURRENT_USER, SubKey(Section), 0&, vbNullString, REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, ByVal 0&, hKey, nResult)

   If nRet = ERROR_SUCCESS Then
      If Key = "*" then Key = vbNullString
      nRet = RegSetValueEx(hKey, Key, 0&, REG_SZ, ByVal Setting, Len(Setting)) '<- here's where I get the error
      Call RegCloseKey(hKey);
   End If
   SaveSetting = (nRet = ERROR_SUCCESS)
End Function

any ideas why I'm getting this error. My virtual disk space is at 1.5GB and I'm sure I have enough memory (1GB RAM), what other resources could be gone? I have nothing else running that uses a lot of resources.