If you are using windows xp machine most new software installation required windows service pack 3. So if your pc has been installed service pack 2 then you have installed service pack 3.
But this trick shows how to make service pack 2 to service pack 3 without installing windows service pack 3. It is done by editing you windows registry. Before that make sure keep a backup of registry.
Let see how to do it
Please use the following steps:
1). Press windows key+R button
2). type regedit and Press Enter key
3). HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\ Control\windows
4). Right click on CSDVersion and edit value 200 to 300
5). Exit form registry editor and restart Computer
