Health Monitor is an extremely useful Windows xp utility that allows you to keep track of your health information online. Sadly, however, this application is permanently dead. The good news is that there is an even better alternative, inspired by Healthmonitor but for networked computers. Audit, which is an open source project, has taken the concept of Health Monitor and improved on it in order to make it even more useful. This software not only acts as a centralized control panel for your whole computer system, it also helps you to track and log almost everything that goes on with your computer - including internet use and time.
With Healthmonitor, you had to put up with a rather poor interface: you had to learn to use a standard Windows tool to get the information you wanted, you had to be careful when editing the values to avoid overwriting them and you couldn't see the values in the Health Monitor window. Luckily, however, a much more advanced replacement, suitable for even networked computers is now available on open source forge (or even google AuditQi.) This software is based on the same principles as Health Monitor, but was written in Java for the Mac. The difference is that this interface is more reliable and works consistently on all versions of windows.
AuditQi has also added many features that allow it to act just like Healthmonitor. For example, you can now setup a number of sniffers and have them randomlyping across your entire network. You can also setup different probes for different computers (such as your workstations) or for different applications. When a probe stops pinging, you will know it's been properly removed from the network (and therefore the threat has been eliminated).