Change Windows xp(sp2) to (sp3) without sp3 patch file

Hello everyone a new post for you:
Want  to change your Windows xp Sevice pack 2(sp2) to Sevice pack 3(sp3) and again  to  Windows xp Sevice pack 2(sp2), without downloading sp3 patch file then follow  this

:Click start
:Go to run
:Type "regedit"(without quotes)
:Click  ok
:This  will open  Registry Editor


SEE The left  column

:In left  column you  will  see  My Computer
:click it
:Now U will  see  five  options under it
:Click on HKEY_LOCAL_MACHINE
:Then Click on SYSTEM
:Then Click on CurrentControlSet

under  CurrentControlSet
       :Click Control
        :Then  click on Windows option under Control


now see  the  right  column
Under name  Column you will see many options

:Now click  on CSDVersion

:A new  dialogue box will appear infront you
     in it change  value  data to
      - 200 for Sevice pack 2(sp2)
      - 300 for Sevice pack 3(sp3)
Click  on  Ok

   After changing the value Restart the computer

After your computer Restarts Right click on  My Computer  icon  on desktop


Then  click  on properties and see the  magic!!!!!!