Eventlog/registry issue with .NET app

I have a .NET app that works on my machine, my partners machine, and our
development server.

...BUT... on our live server, it will not write to the eventlog, as is
does on all these other machines.  Thanks to help I got on this site, I
do have errors going to the database, but this message I get says that
the "Requested registry access is not allowed"

I've tried the solutions suggested on the web, like creating a key for
the registry, and I looked at the machine.config file to change the user
to "SYSTEM"  - tried giving write permissions to aspnet.net user for the
eventlog key.  Still doesn't work.  Why - oh why on this one machine,
which is set up like all the others?  Any ideas for fixing it?

Thanks very much in advance if you can help.

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