>In a windows 98 pc when the user starts two instances os VFP 6 sp3 application, after a while it gets a "Not enough memory to complete this operation" error.
>
>Please help me in the strategy to find what its causing the problem :
>
>1. how do i know the amount of memory available that's causing the error
>2. why don't i get this error in a win nt 4 system

My PC runs WIN98 with 64 MB. Oftentimes, I have 3 VFP6 SP3 instances but it's still OK. I would suggest you to simulate the problem by looking for another PC with the same specs and see if the error still occurs. Take a look also on the PC specs. you mentioned that runs WIN NT and compare with the one runs WIN98.

More often than not, this problem is caused by PCs defective memory slots or the memory chip itself.

HTH