Problem with Network Segment \% Network Utilization
The problem is that it seems to have been discontinued in Windows 2000 onwards. Several respected sites claim you can install Network Segment via the Network Monitor, or Protocol Driver. For what its worth I have tried numerous techniques of getting the counter to appear in performance monitor without success - I agree with Microsoft Network Segment is no longer available.
Microsoft's TechNet article 253790 Says:
SUMMARY
In Windows 2000, installing Network Monitor does not add the Network Segment object in System Monitor as in Microsoft Windows NT.
MORE INFORMATION
To increase the stability and reliability of the Windows Management Instrumentation (WMI) interface, this object has been removed from System Monitor in the Performance tool in Windows 2000.
Network Monitor 
Microsoft have supplied Network Monitor from NT 4.0 onwards. I mainly use the Network monitor to troubleshoot connectivity problems, however you can use it to check network utilization. The diagram to the right shows a peak of about 85% and an instantaneous value of 81 or 82. This is merely a snapshot and unfortunately the Network monitor does not keep permanent records of network utilization.
Additional Counters to investigate
UDP\ Segments Received/sec
UDP\ Segments Sent/sec
TCP\ Frames Sent/sec
TCP\ Frames Received/sec
Server\ Bytes Total/sec
Server\ Bytes Received/sec
Server\ Bytes Sent/sec
Solutions to Network Problems
- Add another network card
- Segmentation - change your subnet mask, add routers
- Switches - install a packet switch
- Reduce Protocols - remove NWLink if you have no more Novell 3/4 servers
- If you must have more than one protocol, check the bindings order in the network icon
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