Hello,
First of all I don't speak English very well so I apologize, now my problem. I install the game everything seem right, when I launch the game it starts normally, but when I start a new campaign or a new battle everytime, I get : Medieval Total war II has encoutered an unspecified error and will now exit.

Here is my log, I think you need this :

10:52:38.109 [system.rpt] [always] CPU: SSE2
10:52:38.109 [system.rpt] [always] ==== system log start, build date: Feb 25 2008 version development ===
10:52:38.109 [system.io] [always] mounted pack packs/data_0.pack
10:52:38.109 [system.io] [always] mounted pack packs/data_1.pack
10:52:38.125 [system.io] [always] mounted pack packs/data_2.pack
10:52:38.125 [system.io] [always] mounted pack packs/data_3.pack
10:52:38.125 [system.io] [always] mounted pack packs/data_4.pack
10:52:38.125 [system.io] [always] mounted pack packs/localized.pack
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction milan (bdg large_city vs clt huge_city)
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction scotland (bdg large_city vs clt huge_city)
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction moors (bdg large_city vs clt huge_city)
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction turks (bdg large_city vs clt huge_city)
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction egypt (bdg large_city vs clt huge_city)
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction mongols (bdg large_city vs clt huge_city)
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction england (bdg large_city vs clt huge_city)
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction france (bdg large_city vs clt huge_city)
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction hre (bdg large_city vs clt huge_city)
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction portugal (bdg large_city vs clt huge_city)
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction spain (bdg large_city vs clt huge_city)
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction venice (bdg large_city vs clt huge_city)
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction papal_states (bdg large_city vs clt huge_city)
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction byzantium (bdg large_city vs clt huge_city)
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction aztecs (bdg large_city vs clt huge_city)
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction timurids (bdg large_city vs clt huge_city)
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction normans (bdg large_city vs clt huge_city)
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction saxons (bdg large_city vs clt huge_city)
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction russia (bdg large_city vs clt huge_city)
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction poland (bdg large_city vs clt huge_city)
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction denmark (bdg large_city vs clt huge_city)
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction teutonic_order (bdg large_city vs clt huge_city)
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction ireland (bdg large_city vs clt huge_city)
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction norway (bdg large_city vs clt huge_city)
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction hungary (bdg large_city vs clt huge_city)
10:52:40.937 [script.err] [error] Script Error in mods/Third_Age_3/data/export_descr_buildings.txt, at line 9154, column 2
Building DB error - culture db max settlement level differs from building db max settlement level for faction slave (bdg large_city vs clt huge_city)
10:53:52.859 [data.invalid] [error] Unable to open file 109026F6/descr_mercenaries.txt
10:53:53.234 [system.rpt] [error] Medieval 2: Total War encountered an unspecified error and will now exit.