For the windows 2000 problem: do you have this on all windows 2000 machines?
We only have one Windows 2000 Professional machine. The 2000 Servers are fine.
For the windows 2008 problem: could you post a screenshot of configuration/memory & configuration/memory array.
Screenshots attached.
In the last scanned times: do you see the memory scanned for the 2008 server?
It was the 16th but I forced another scan using lstrigger just to be sure. Screenshot attached,