You have downloaded and unpacked the BiG World Fixpack right? At that point after the trimpack IIRC the window should close and the fixpack should be launched automatically. If you have done so then I don't know what is going on.
I redownloaded it and unpacked it into the BGII - SoA folder and it only overwrote a few files. Seems to work fine now. Weird because the .bat file was there and most of the folders. Anyhow, it seems to be working now. Thanks for the help.