Internet speed really slow!!!

What should i do if my windows 7 internet speed is way too Slow ?
ANSWERS :
if your using wireless connection
1. Go to Control Panel > Power Options .
2. Click Change plan settings next to your current power plan.
3. Click Change advanced power settings .
4. Double-click Wireless Adapter Settings .
5. Double-click Power Saving Mode .
6. Change the setting to Maximum Performance .

for others :-

1. Click Start > All Programs > Accessories .
2. Click Command Prompt with the right mouse button.
3. Click Run as Administrator .
4. If there's a User Account Control prompt, click Yes .
5. Type netsh interface tcp set global autotuning=disabled in the Administrator Command Prompt window, then press Enter .
6. Go to control Penal > Network Sharing Center> Change Adapter Setting Disable all wireless Connection. 
7. while your there .. Right Click on Local area connection > Properties >uncheck IP v 6 .>
Restart your PC


even you can try this :-

1. Click Start > All Programs > Accessories .> open run
2. Type  Prefetch > Enter > Delete All .
3.  Delete all cookies from your web browser .Tools > Clear Recent History > check Cookies > Delete Everything .
4. Restart your Browser .