How to Upgrade Windows 7 service Pack 1,2,3

Hello guys , today i m going to show how to install service packs on windows 7 in any editions without install any software.for this follow these steps:

Step 1: Go to windows menu bottom and type run
            or press windows menu and R from keyboard
Step 2:  Type REGEDIT for registry editor and click yes
Step 3: click on HKEY_LOCAL_MECHINE
Step 4: Click on  SYSTEM
Step 5: Click on CURRENT CONTROL SET
Step 6: Click on CONTROL

Step 7: Scroll and Click on WINDOWS
Step 8: Now in right side you should select and Double click on CDSVERSION
Step 9: Now put the Value 100 for service pack 1,200 for service pack2 & 300 for service pack 3 then click OK
Step 10: Now restart your PC .it may take 10 to 30 min for install

Now Right click on computer icon and see properties you have installed service packs.

Thank you!!!!