The technical team at Equis might have a better understanding of this error, seeing as they wrote the code, but I will ask:
What was MS doing at the time the error occurred?
What data was the EST working with?
Under what operating system is MS installed?
What permissions does the user have over the folder where mswin.exe resides?
wabbit
"The question of whether a computer can think is no more interesting than the question of whether a submarine can swim."
Edsgar W. Dijkstra
MS: 6.52 EOD, 7.x EOD, 8.0 PRO, 9.2 PRO w/QC, 10 PRO w/QC & MDK
For custom MetaStock programming : http://www.wabbit.com.au
My SkyPE status : 
My SkyPE account : wabbit.com.au