How to convert windows XP sp2 to sp3

Friends, u can now convert your windows XP sp2 to sp3...
Here are the steps:-
1. Go to run
2. Type ''regedit''
3. Go to HKEY_LOCAL_MACHINE
\SYSTEM\CurrentControlSet\Control\Windows
4. Modify ?CSDVersion? from ?0?
00000200? (SP2) to the Windows XP
SP3 value of ?0?00000300? and reboot
that's all and then your windows will be converted from SP2 to SP3  5. If you want your sp 2 again than you can undo the above process by changing that value from
0?00000200? to 0?00000300?