Set up Windows XP without its serial key

Hello,
I have a Windows XP bootable CD. This is service pack 2 edition. I want to set up Windows XP with this CD.
But a problem occurred. I lost my serial key for this CD.
Right now I am not accessible to shop where I can buy a new CD.
Is there any way to setup windows XP with that CD without entering the serial key?
Can anyone help me to overcome this issue?
