I'm opening a new thread because I think that my problem is different to those already posted.
I have Tales of Monkey Island Episode I installed and got it to work properly. I've played through the beginning of the game, got to the island without problems and explored the jungle to the point where I found the hole in the ground on the Treasure Site.
When I later returned to the Treasure Site using the World Map, the game crashed with no message, just the standard Microsoft "send report" dialogue. Then, when I tried to restart the game, it crashed instantly when I clicked "Launch Game" on the Telltale starter. I haven't been able to get it working since. I restarted my computer and that didn't help. I used Hashcheck as suggested in other threads and it found no problem.
I'm on Windows XP and used the latest Direct X updates that came with the game. I don't think DirectX can be the problem as the game worked properly already. I think the savegame is messed up because the game loads your current savegame when it starts and might crash because the save is invalid.
What can I do?