Tuning network(TCP) in windows 7

• To show the TCP global settings:
  netsh interface tcp show global
  Querying active state...
  
  TCP Global Parameters
  ----------------------------------------------
  Receive-Side Scaling State          : enabled
  Chimney Offload State               : automatic
  NetDMA State                        : enabled
  Direct Cache Acess (DCA)            : enabled
  Receive Window Auto-Tuning Level    : normal
  Add-On Congestion Control Provider  : ctcp
  ECN Capability                      : disabled
  RFC 1323 Timestamps                 : disabled
  ** The above autotuninglevel setting is the result of Windows Scaling heuristics
  
  overriding any local/policy configuration on at least one profile.
• To enable CTCP:
  netsh interface tcp set global congestionprovider=ctcp
  To disabled CTCP:
  netsh interface tcp set global congestionprovider=none
• Disable Green Ethernet in Realtek NIC driver advanced properties. 
• Measure the hard disk (drive letter c) throughput in windows vista/7
winsat disk -drive c
• Reference: Windows 7, Vista, 2008 Tweaks