Wrong patch.
Uninstall and prepare to reinstall in one of the following orders,
1) The ultimate patch would be Trials of the Luremaster, an official expansion cum patch that is only available through download.
- Install IWD
- Install HoW
- Install TotL
http://www.fileplanet.com/62184/6000...the-Luremaster
2) If you do not want TotL, then you need the HoW patch v1.41
- Install IWD
- Install HoW
- Install HoW patch v1.41
http://www.fileplanet.com/58826/5000...f-Winter-Patch