Hi and welcome to the forums! What is BGT - W10?Also, I'd recommend installing the BG2 Fixpack to the BGII game before BGT-ing it.
Ah, sorry - I meant that I'm running Windows 10, in case there's OS version issues. I'll try installing the fixpack first and then BGT, see if that helps.
Edit: No, doesn't look like it, I'm afraid.