>We have a workstation (IBM netvista 1.8) who make lot of calculation using hundred of program. Since two day we have an error C000008E this is a division by zero. This computer is running under NT 4 pack 6.

Print driver? Some print drivers fiddle with the FPU, changing error handling from hardware to software. VFP assumes no one has changed the FPU error handling, so when a math error comes down the pipe, VFP crashes. Try changing the drivers from the ones that came with the printer to the ones that come with Windows.