64kb video card? Is it running Windows 3.1?

So you are able to load Beyond The Sword without the mod, correct? It's just when you attempt to load the mod, you run into issues?
If so, then I agree with Oyzar's assessment; either the mod was unpacked badly (managed to get corrupt) or else you placed it in the wrong location.
The final folder to be dragged into the BtS /mods/ folder should read
/40Civs/ Be sure you are not attempting to load up /40Civs50/40Civs/ as that won't work (shouldn't crash the program, but it won't run properly).
So, please confirm you can load up BtS without the mod first. Then, check the location and if it's in the correct location (read the readme.txt file) then I would suggest you download and unpack with a different program, such as 7zip. Or email me and I can archive as a .zip instead.