If he has Patch 1.1 then he should have the Unpacker folder (actually it should be in a folder called tools that is in the same sub folder as the Data folder. The npaker Folder is i the Tools folder).

Peice of advise. Tell him to uninstall the game. Go into his M2TW folder and find the folder called "SEGA" delete it manually.

THEN and only then, re-install the game.

Tell us if it still crashes after that.