I vaguely recall something about CDILLA and TurboTax causing problems with the game. If you don't have anything that modifies CDILLA on your system, you might try removing it fully in case it managed to get borked somehow, and reinstalling. Some virus and spyware scanners tend to pick up CDILLA as well, so you might have accidentally deleted it too.
There's an IS/Clan pack safecast utility out there, but the only link I found for it on the forums went to MWL, and I don't have an account to login anymore.
For what it's worth.Edit: Though, come to think of it, it was predominantly a 'Mech Pack problem and I don't think it crashed the base game. Still, worth a shot I guess.