Help! Bernard's in my computer!

[Dan0859]

First, as a newbi, I want to say how helpful this forum as been for me, as far as learning and understanding the game. Now, for my problem. I bought SH3 about a month ago, as a download. I downloaded it, installed the patch, and everything was fine. Yesterday, when I tried to play, the game would load, but as soon as my mission started, it would freeze, and nothing would work. I've tried deleting it (including the file in My Doc's, and did a search to delete anything else labeled "sh3"). I reloaded the game, downloaded the patch again, but nothing helps. Both careers and single missions do the same thing. They load and start, but after 30 sec. to a minute, they freeze. I tried the delete-reinstall routine about 5 times, without any luck.
I even tried to go back to Direct2Drive, and buy another copy, figuring I'd delete the old ZIP file and start completely over. Well, I can't even do that. Their policy is that you can buy the game only once. That, I totally don't understand. Plus, they won't refund a purchase of a game. Any help would be appreciated!