Please help, CTD when Romano-Brits are made!

[gmjapan]

I play as Saxons and when I capture the second town in the UK isles I get a Crash to Desktop. I assume this is when the Romano British are made.

My autosave is at the point of siege, they sally forth when I hit end turn and i crush them coz i'm ace (!?). Then after the battle it plays the victory music and I get the loading screen like its going back to the campaign map and then just when it finishes... CDT!

Obviously I cant progress past this point in BI and I can only assume it would happen for every "split" faction you can make. The rest of the game seems to work fine, I have no graphical glitches or problems with the intros.

I did have the original RTW CTD when I tried to run it since installing BI but I fixed that by installing the Media Format9 again from the RTW disc1. I have had this problem with the capturing of the second UK town before and after that reinstall. I have also completely reinstalled the game.

I wanna play!!