Thanks for the help guys.

I think I've tracked down what is causing error. The program I am writting has a procedure that zips the files in a directory and then removes all the files (less the zip file). It appears once the zipping process is done and returns control back to fox that is when the error occurs. I did test this manually, it takes running it acouple of times to do it, but I managed to recreate the error.

I'm going to try changing the stacks to 9256 and see home many times I can procedure before it crashs. With what ever win98's internal setting is I can get about 3 or 4 runs currently. This program is one that will constanly be running. Will upping the stacks help the memory manager in releasing and reallocating the memory and stacks correctly or do you think there issues there?

The zip utility is pkzip 2.50 for dos.