However it may sound unlikely, there's a bug in Windows code (NetBIOS code) starting with Windows NT and up to Win2K3 R2 that may, under certain circumstances, cause such a problem.
We have now, together with the MS engineers, identified the problem and found a work around that will let us modify the aswTdi.sys driver so that it won't crash the system any more. Simultaneously, MS will fix the bug in one of their upcoming Windows updates.
BTW The bug is already fixed in the latest Windows Vista builds.
Thanks
Vlk