NT4 service pack 4 is still in beta, and because of that I have not messed with it on any of our production machines. I ma not sure what effects it will have on the IIS sub-system, but I would try uninstallingthe beta SP and revert to SP3 and see if that clears your logging problem.<br>
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Other then that you can try running the NT Option pack install again and hit the add/remove button. This will allow you to go into the set-up options and make sure that the logging components were in fact installed.<br>