WSPR crashes on RX

Hi All,
I am new to WSPR and trying to get started on 20m where I have been active using Digipan.
My problem is that although WSPR installs and I can get to the start screen - as soon as the RX starts the program crashes and I get the Microsoft 'WSPR encountered a problem etc etc.
I have tried setting my options differently; checked device manager; shut down other running programs - no luck.
I am running WSPR 1.12 on my Pentium 3.06 desktop with XP Home. Any ideas please?
73 Chris