What exactly do you mean with "loading BG1RE into the BWS"? Do you mean installing after a full BWS Mega-Modification was set up?I give no guarantee if a mod is installed after the generalized biffing, if an animation and the according sound are in different locations this can also lead to a crash.
For your crash, the content of your error-log would be helpful. To enable the error-log, you'd have to edit the baldur.ini in the section "[Program Options]" with the following:
Then you produce the crash. In the game folder should be a file named "baldur.err" now, please post the content here.