As MrT says most likely causes are wrong directory or wrong publisher version.
Also if you are on XP/Win2000 you must be the admin for the account you are using. You may also try unistalling the game and then do a fresh install and then apply 1.02.
Also if you are on XP/Win2000 you must be the admin for the account you are using. You may also try unistalling the game and then do a fresh install and then apply 1.02.