Measuring Network throughput in Windows

There is a nice tool called netperf to measure the network throughput. There is a port for Windows available here and it is very easy to use:

1. On the server side start:
   cd c:\downloads\netperf\
netserver.exe
2. On the client side start:
   cd c:\downloads\netperf\
netclient.exe -H <IP.OF.SERVER>

You can find more info over here.