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My natural recommendation is: Monitoring Studio KM. It can connect to older Windows systems with WMI (to execute commands, parse files, check Event Logs, services, performance counters, processes, etc.). It can also connect to any system through SSH.
You'll have to "design" the monitoring yourself, but for basic monitoring, it will be relatively easy!
Razeem Mohamed (consultant with Sentry) can definitely help you out!
Hope this helps!