hayes isdn TS - USB won't install

[Ian F]

Trying to install the isdn TA above, onto a Toshiba tablet PC - the
installation runs fine until it tries to install the WAN capi driver and
then I get a blue screen crash every time (too fast to read !)

Anyone else come across this, or know of a solution - I'm trying to use the
latest XP Drivers direct from Hayes, and can't find any reference to the
problem on the MKB.

Thanks

Ian F