You have to do one more thing before installing TATW again: Check the Virtual store for any Third_Age_3 folder.
1. Go here and apply step 3 from section How to fix it for your main M2TW folder ( C:\ Program Files\ SEGA\ Medieval II Total War, or if you have it installed somewhere els, apply it on that M2TW folder, for example: D:\ Games\ SEGA\ Medieval 2 Total War).
2. Uninstall TATW using Control Panel\ Uninstall program.
3. Delete manually Third_Age_3 folder in your ......\SEGA\Medieval II Total War\mods folder.
4. Unhide hidden folders:
On your DESKTOP, click on START in the bottom left corner, in Search Programs and Files type in Folder Options, click on Folder Options, go to VIEW section, and in Hidden files and folders check the box next to SHOW hidden files, folders or drives. Apply, and OK.
5. BEFORE installing Third Age again, go to Virtual store ( C:\ Users\ [user name or your PC`s name]\ AppData\ Local\ VirtualStore\ Program Files\ Medieval 2 Total War\ mods folder), delete Third_Age_3 folder found there.
6. Install all four TATW parts - TATW part 1 and part 2, TATW patch 3.1 and TATW patch 3.2 ( CHECK the INSTALLATION paths carefully for ALL Installers, usually it is C:\........\SEGA\Medieval II Total War, but it can be some other folder path for you if you installed M2TW somewhere els)
7. For battle crashes, Disable daylight saving settings, you have Windows Vista, go to Control Panel, Clock, Date and Time, Change the time zone, Change time zone, uncheck `Automatically adjust clock for Daylight Savings time`.
Good luck!