Problems loading diablo 2 lord of destruction expansion on windows 7?

Try using the downloaded version from Blizzard's site. Go to battle.net and make an account or log into your existing one and there should be a link to add a game. You can put in your Diablo II and LoD keys to register them to your account. Then you can download the full game off their site. From my experience, these downloaded versions work better on Windows Vista and 7.