When I play Shandalar, I realized that when I buycards, or win them in a dual, I can't use them in my deck. They simply don't appear, to be added. Can any one help me out. I am a huge fan of magic the gathering and would really love to play this game a gain.

Try this thread: http://www.ntcompatible.com/thread.php?id=26239. I think, your problem is relate to program conflict (something in memory blocks cards appearing and must be removed), and was solved more than once there.