Corrupted files?

[Mikeus Caesar]

I was playing my greek campaign last night, for the first time in a month, trying to get it finished before i download RTR, when i noticed two things. The first thing was that on the campaign map, rather than playing the music RTW usually plays for non-roman factions, it was playing the roman music, with that nice voiced woman singing about gladiators and victory, or something similar. Second problem was when i had a battle. I was in the middle of the province called 'Pripet', in the marshes battling some rebels. The map loads up and.....welcome to the sahara desert!! Instead of pripet marshes, i had the sahara desert, with the ocassional group of big nordic trees here and there in the distance.

Does anyone think my files may be corrupted?