Convert Xp sp2 to sp3

Method 1:
copy the below code in a notepad

Windows Registry Editor Version 5.00 

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Windows]
"CSDVersion"=dword:00000300
"CSDReleaseType"=dword:00000000
"Directory"=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,\
74,00,25,00,00,00
"ErrorMode"=dword:00000000
"NoInteractiveServices"=dword:00000000
"SystemDirectory"=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,\
6f,00,74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,00,\
00
"ShellErrorMode"=dword:00000001
"ShutdownTime"=hex:44,14,70,45,f4,7a,ca,01 


save as sp3.reg
start it
restart pc
done !!
to convert xp sp2 to sp3

Method 2:

1)Press Windows+R. and type regedit

2)Browse to "HKEY_LOCAL_MACHINE\SYSTEM\ CurrentControlSet\ Control\Windows"

3)Now change the value of CSDVersion" from "0x00000200" to "0x00000300"

4)Now Click Enter or OK and close the Registry Editor

5)Reboot the System