While it won't help you solve this problem, I'm going to come back to my arguement that the "proper" way to this kind of thing is throught COM+. That's what it was designed for. It may require some rework of your code to get it working, but you will avoid problems like this. The whitepaper on my web site for more information.

>Hi. I have a VFP 6 app running on multiple notebooks. They exchange data with the server using COM/DCOM. The COM server is also written in VFP6. Some of the notebooks are starting to get 'RPC server is unavailable' (when trying to CREATEOBJECTEX()). The affected notebooks are some of the ones they've upgraded to Win 7 or the latest XP patches.
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>Any ideas?