[Dx4win] Help:DX4WIN and RigExpert Crashing System

[Anthony R Gargano N2SS]

I am using DX4WIN version 7.01 in conjunction with a RigExpert interface 
box. I can get to the point of rig control and CW keying and sending, but 
if I click on Radio "Stop" or Radio "Start" my WinXP PC crashes and the 
Blue Screen indicates the file ks.sys as the culprit. I have tried various 
configuration set-ups both in DX4WIN and the RigExpert interface box driver 
but always with the same crashing problem. I had read somewhere that DX4WIN 
is not friendly towards Com port CW keying. Is this my problem? Or am I 
missing something in the configuration setups? Any suggestions would be 
greatly appreciated. Thanks, Tony N2SS