This had been a real headache for me. I followed this guide exactly as written and my games suddenly stopped loading (BG, BG2, and, for some reason, IWD and Planescape: Torment). I then followed this guide on my laptop and have had no problems with it at all.
I uninstalled BG and BG2 and completely removed all traces of the games from my computer, and the mods I installed. When I did a clean install the games worked again, including the other IE games. I then followed this guide and for whatever reason it worked using all of these mods.
Then i tried starting up BG2 today and I went back to the same problem I had initially. BG2 would load a black screen and then it would hang there indefinitely. Same for BG, IWD and P:T. Again, doing a fresh install after a complete uninstall seems to have fixed this, as I can no load the unmoded version of BG and BG2 without issue.
My games are installed in a folder called "GOG Games", on a completely separate hard drive. I have full admin privs and run everything as admin, have UAC turned off, anyway. I tried rolling my nVidia drivers back 2 years, as someone said the new drivers cause issues with IE games, and had no luck. I uninstalled all the mods listed here, one by one, and tested the games, and had no luck. It wasn't until I did a complete uninstall and reinstall that the problem was fixed.I'm really stumped on this and would like to sort this out, so I can at least use the widescreen mod. It doesn't make sense to me that other IE games won't work when they previously did if all I'm modding is BG2. It doesn't make sense to me that it works for 2 days and then suddenly doesn't work again.
Anyone at all have an idea of what I could possibly do about this?