You need to put in your own critical error handler. There is an example for doing this for DOS (INT24) using the Microsoft C compiler on MSDN:-

Using _harderr to Capture Critical Error Interrupt 24h
Keywords : kb16bitonly

You can do exactly the same using the Borland compiler I just don't have an example to hand. I do however have the manuals for every Borland development product and will attempt to look at it tonight for you.

HTH
Neil