~ go to start---->Run--> type the word Regedit



~ Your windows Registry Editor will open,



~ Go to HKEY_LOCAL_MACHINE\SYSTEM\ CurrentControlSet\ Control\ Windows



~ Than please modify “CSDVersion” from “0×00000200” (SP2) to the Windows XP SP3 value of “0×00000300” and than reboot your system.



Now your Window has been upgraded to SP3 and you will be able to installed various advance softwares.