Game crashes after 54 turn

[VoiceV]

Game crashes after 54 turn. Crash happens right after or before rebels turn. I'm using SS 6.4, but i had this problem on SS 6.3 too. I dont use any other mods.

System: Windows 7 SP1 (I had this bug with XP too) 4Gb RAM, GTS 450, 267.59 drivers version.
Log:
"21:32:42.454 [system.rpt] [always] CPU: SSE2
21:32:42.454 [system.rpt] [always] ==== system log start, build date: Feb 25 2008 version development ===
21:32:42.516 [system.io] [always] mounted pack packs/data_0.pack
21:32:42.563 [system.io] [always] mounted pack packs/data_1.pack
21:32:42.594 [system.io] [always] mounted pack packs/data_2.pack
21:32:42.657 [system.io] [always] mounted pack packs/data_3.pack
21:32:42.813 [system.io] [always] mounted pack packs/data_4.pack
21:32:42.859 [system.io] [always] mounted pack packs/localized.pack
21:35:56.242 [system.rpt] [error] Medieval 2: Total War encountered an unspecified error and will now exit."





What should I do?