I have 2 systems, that, no matter what I do to them, register new names
every few days. They tag a new GUID to the end of their name and claim
that they're doing this because the current name already exists. I was
hoping that the 10.0.3 update would solve the problem but it hasn't.

I've tried uninstalling and installing the agent fresh as well as
updating it to 10.0.3. I've also did an unregister and reregister after
having deleted the keys from the registry for the machine name and
pre-agent GUID.

What next?