can' t patch diablo 2 pb with game.exe help!!!!!!!!!!

[tuz]

HI I'VE JUST INSTALL DIABLO 2 AND WHEN I TRY TO PATCH IT IT SAYS SOMETHING LIKE:"THE FILE DOESN'T MATCH THE CHECKSUM" IT TALKS ABOUT THE GAME.EXE.(but i haven't cracked it yet)
IT RECOMMENDED ME TO RE-INSTALL DIABLO BUT I'VE ALREADY DID IT SOMETHING LIKE 5 TIMES AND IT'S VERY ANNOYING.
WHAT's WRONG ?
HOW CAN I SOLVE THAT ?
IF NEEDED, MAY SOMEONE MAIL ME HIS GAME.EXE