Ok, so to clarify, I'm going to patch my full install BG1+Totsc, uninstall WeiDU from BG2+TOB, then reinstall it? I'm sure I should also patch BG2, although I have the version that they're selling now. Thanks for your explanations and patience.
So I did a search for my problem and this thread came up. I am having the same difficulty, and the response was not particularly helpful, particularly since I have Vista, not XP (don't know if there's a difference). Is there anything I can/should have done to fix this? Will fixing entail re-installing any/all of the games? Thanks in advance.