Install both games to 2 different folders preferebly in the C:\Users\*Windows username*\Documents\*Games*\ Subfolders, where the *these* are what ever you set them to be, and then check that the game works normally before you install any mods to it.
Know also that the "Documents" and the "Users" folder names can be marked as something else in your Windows language, but they are actually "Documents" and "Users" in the file system, because the programmers that did the localization were .... technical idiots, cause they couldn't localize the actual folder names, for technical reasons.
This is so that you can actually modify the game files, as the game was made to a system that is no longer fully supported. Install it anywhere else and then you can't, cause Windows.
Yep, Jarno Mikkola. my Mega Mod FAQ. Use of the BWS, and how to use it(scroll down that post a bit).
OK, desert dweller, welcome to the sanity, you are free to search for the limit, it's out there, we drew it in the sand. Ouh, actually it was still snow then.. but anyways.