This looks to me like a case of not patching properly.
2. INSTALLING PATCHES:
2.1 Copy Data folder over to your World of Warcraft install directory (e.g. C:/WoW/) and accept overwrite/replace if required.
2.2 Launch the client through WoW.exe (you can create shortcut of it and use that instead).
2.3 If the client doesn't crash, then client installation is successful. Move to connection (3. section).
Try redoing this again.
Also try making your torrent program, Force Recheck (should be accessible by right clicking, but you might need to stop the torrent first.)
2. INSTALLING PATCHES:
2.1 Copy Data folder over to your World of Warcraft install directory (e.g. C:/WoW/) and accept overwrite/replace if required.
2.2 Launch the client through WoW.exe (you can create shortcut of it and use that instead).
2.3 If the client doesn't crash, then client installation is successful. Move to connection (3. section).
Try redoing this again.
Also try making your torrent program, Force Recheck (should be accessible by right clicking, but you might need to stop the torrent first.)