>>>>With one compiled program (a small exe with nothing included, just the main) when run on WIndow 95/98 a number of other programs crash when the exe is open. We've had problems with Explorer, Outlook, Eudora and Adobe PhotoDeluxe so far (just two installations) We found no problems using NT.
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>>>>Anybody has suggestions ?
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>OK. What version of VFP? Are you using any ActiveX controls? Does it happen when just a particular form is open, or just the application. Does it happen when the app is minimized? The first thing I would suspect is video driver problems.

VFP 5.0 There is only one TreeView control that is seldom used. Apparently the problem arises even if the control has never been accessed. I will set up a machine tomorrow morning to try and reproduce the error. After that I'll be able to answer your other points. It seems that it's enough for the app to be opened to stop the other programs. Unfortunatly the customers are quite far and I will not be able to see them for a while. But, if they restart the machines everything is ok again. Wierd...