ActiveXperts Network Monitor 2019 proactively manages network servers, devices, databases and more.

Microsoft Resource Kits - Windows 2000 Resource Kit

Dureg.exe  (Windows 2000 Resource Kit)

The Windows 2000 Resource Kits help IT professionals deploy, manage, and support Windows 2000 operating systems.
There are a number of Windows 2000 Resource Kit software tools available for free download from Microsoft. These tools are listed below, and can help you streamline administrative tasks such as managing Active Directory™, administering security features, working with Group Policy and Terminal Services, automating application deployment, and other important jobs.

Dureg.exe - Registry Size Estimator
DuReg is a command-line tool that enables you to discover how much data is stored in the registry, or in any registry subtree, key, or subkey. The tool also enables you to search for all occurrences of a text string in the registry. This search can be limited to a specific subtree.