Heh, well, you're right, Andrewas, I found that out last night.

It's clearly made for mods only and not for different versions of the game. It's still a nice utility, though, if one wants to play the game with the Kelsey mod and separate game with the Solaufein mod, etc. Great concept, but didn't work in this situation.
*sigh* and because of the registry problem, it may not work in my situation as well. Oh well...thanks for the help anyway guys. I wasn't sure if it could work or not.
I may try that trick with the two accounts and see if that works. Since I now have ToB installed, I can try to create another account and see if I can just install SoA to it. Again, though, I'm not sure, because I think the registry is global, unless it pertains only to that hive for the individual user. Since all I have is XP Home Edition and not XP Professional, it may not work. But it's worth a gamble.
Thanks,
-Sazerac