Dan - but when I had 98 I didn't know about TweakUI

Anyway, back to BT. The BSOD has only ever happened when I have had the BT enabled on my PC - both last time when I installed it with the supplied software, and this time when used with the proper Widcomm software. So my thinking is that it is not so much the software, as maybe the Windows stack conflicting with either of the other two types of stacks used.

Or it could simply be a conflict between the particular BT dongle I have...?