The button fix will resolve most campaign map CTDs irrespective of the OS you are running: https://forums.totalwar.org/vb/showt...=1#post1921448
The button fix should always be applied, there are no side effects and it's the first stage of the crash troubleshooting process. Coming here posting about crashes without first trying the button fix is a waste of everyone's time.
For Nvidia users with graphics cards of the 8xxx and 9xxx series there is no known solution for the problems in battle (inability to direct your units etc). Some of the newer Nvidia cards also seem to be experiencing similar problems.
For the resolution issue (i.e. stuck at 800x600) try running "msconfig" click "boot.ini" tab, followed by "advanced options" button. In the box that opens click the /maxmem checkbox (do not change the number), click ok and ok again and reboot. Then try running the game again. If it makes no difference you can try temporarily restricting your memory to sometihng like 1GB by entering something like 1000 in the /maxmem box, rebooting and trying again. Be careful in there - if you screw up your system by clicking the wrong thing, it's not my fault or the .org's.
If the campaign map scrolling is very slow, this can be improved by disabling vsync and/or by trying this untested and unverified approach: https://forums.totalwar.org/vb/showt...n-strategy-map
To disable the intro videos, create an empty text file called "skipcredits.txt" and place it in the same directory as "Medieval_TW.exe". (Should be something like "C:\Program files\Total War\Medieval Total War\" ~ differs between different releases).
To run the game on the desktop in a small overaly (not a window), change your desktop colour depth to 16 bit colour and edit the shortcut as the example below:
"C:\Program files\Total War\Medieval Total War\Medieval_TW.exe"
To:
"C:\Program files\Total War\Medieval Total War\Medieval_TW.exe" D
Before doing this ensure that you're running the game at a lower resolution than your desktop resolution, or it will crash. Change the resolutions for both the battle map and the campaign map - it's good practice to keep them the same and also to use 16 bit colour when running the game whether you run it in the small overlay or not.
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