CTD late in the game

[joecool250]

hello i have had a game going for a long time, and lets say the empires are no longer historically accurate. the final faction (i cant spell it but its the Islam faction thats black), the game crashes to an unknown error when it comes to its turn. it seemed to be that the problem i was at war with them but not any longer. i dont know whats going on. i have been working on this campaign for a while. its the late campaign and i am playing as england. i am uploading my quicksave in a zip file incase you all want to try it. i am using 6.1 and installed both parts of 6.0.

by the way my system log says.
20:51:29.664 [system.rpt] [always] CPU: SSE2
20:51:29.664 [system.rpt] [always] ==== system log start, build date: Feb 25 2008 version development ===
20:51:29.664 [system.io] [always] mounted pack packs/data_0.pack
20:51:29.664 [system.io] [always] mounted pack packs/data_1.pack
20:51:29.679 [system.io] [always] mounted pack packs/data_2.pack
20:51:29.679 [system.io] [always] mounted pack packs/data_3.pack
20:51:29.679 [system.io] [always] mounted pack packs/data_4.pack
20:51:29.695 [system.io] [always] mounted pack packs/localized.pack
20:55:50.057 [system.rpt] [error] Medieval 2: Total War encountered an unspecified error and will now exit.