A few things I can think of, though I'm not sure they'll help you:
1 - After uninstalling, remove all BGII related entries from your registry. Also remove any remaining files on the HD (eg. override directory)
2 - Re-install the game (SoA only, no mods).
3 - Start up the game and try making a new game.
4 - If it works, install ToB and test again.
5 - Intall the official patch, and then any other mods you may like to use, remembering to test after each one.
If the game crashes at Step 3 or 4, then the only thing I can think of is a problem with your CD's. Try lending a friend's and installing from them.
If it crashes after installation of a mod, e-mail the author of that specific mod or component.
Hope this helps a little.