>I believe I saw the same message fairly regularly running a commercial VFP application named SBT 5.0 on Windows 95 machines (no not all of them, just some - puzzling). I messed around doing all kinds of "smart" things like making sure the client machine had the latest version of VFP500.dll, etc. and I couldn't nail it down. I was in the process of rolling my network to all Windows NT workstation and I *never* saw the error under NT - so I just accelerated my upgrade schedule and the error went away!
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>Probably not the answer you were looking for, but that's how I got around it . How desperate are you?
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>Kevin E. Stroud
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>I have asked this question before without response.
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>A user is getting a crash with message"This program has performed an llegal operation...ETW.EXE caused a divide error in module VFP.DLL at 0137:100A5821..."
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>The crash is consistently occurring in the same place in the opening of a form from inside a form.
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>I don't get the error on my system, either in development mode, or as a similar separate executable.
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>Can anyone help please? I'm now getting desperate.....

Check what Tony Miller has to say about video drivers since you say it only happens on your client's machine. Has your client installed some software which is not on your machine and is running concurrently? Also, does your app have any custom DLL's or FLL's?