Does that mss32.dll error come up every time you try and start BI now? If so, somethings gone badly wrong somewhere.
However, if it was a one-off, and BI still loads but crashes like you mentioned before, it suggests there's a problem with one or more of the data files. It could be as simple as a mistake in the export_descr_unit.txt file, or something more serious. The game checks the data txt files when it starts up, and even a little error in the export_descr_unit file is enough to cause the game to crash to the desktop before reaching the menu. Hopefully you made backups when editing and if you revert to the original edu.txt file or anything others you've messed with, then hopefully the problem goes away.
Also, are you using the -show_err switch? If you had been using it, the game will (usually) report what is wrong when it crashes. There are about 4000 threads mentioning how to use the -show_err switch, and it's crucial anyone modding uses it.
As to the update_bi file. This is a batch file and runs a series of commands when clicked. It doesn't appear to be for general use, more for the developers and mistakenly left in, or part of the patching process. By the looks of things, it may have deleted stuff you need to play the game, namely everything to do with .item files. Never click on a batch file when you don't know what it does. This could be the root of your problem, and if so, a re-install looks extremely likely.
Someone more knowledgeable about this kind of stuff could probably be of more use though.
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