Here is a small tutorial on how to check TCP settings through command prompt in Microsoft Windows 7.
Click Start, type “cmd” (without quotation marks) in the search field. The CMD program will appear, right click over it; click run as Administrator. A security prompt will appear, accept it:
Now, in the command prompt window type:
netsh interface tcp show global
Hit Enter. It will show the TCP settings like in the screenshot:
Make a restore point before if you need to proceed  further. To exit from command prompt simply type “Exit” (without quotation marks) and hit Enter.
If the line  for automatically adjusting the receive level window does not say “disabled”, type this command :
netsh interface tcp set global autotuning = restricted
If not OK, replace the command and see if it works:
netsh interface tcp set global autotuning = disabled
At this point, you will notice significant improvements in your browsing speed. If it works, you will notice the difference in browsing speed immediately.
If this does not work for you, and you feel the need to default values, you can type this command:
netsh interface tcp set global autotuning = normal
