i installed xp on my laptop a few months ago the key code was torn off by one of my kids is there a way to get into the os on my laptop to get it

You can do a bit of reading at the links below, however, a call to Microsoft may be needed.

http://www.microsoft.com/piracy/basics/activation/

http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/bulletin/MS03-043.asp

http://support.microsoft.com/?kbid=826939

http://www.labmice.net/WindowsXP/articles/changeID.htm

http://techrepublic.com.com/5100-6270-5034890.html

:)