hi, the trick is very simple:
have installed win 7
install SL or LEOPARD
boot with the win 7 cd or usb key(the method that you used to install win7)
let it load,after the language selection go to repair.
at the new window open comand prompt
select disk 0 (enter)
select partition 3 (enter)
after restart,start again with cd,it will now tell you to repair and restart (repairs the boot loader of windows),if not choose it your self
now you can enter in windows after reboot.
in windows now:
open comand prompt (start accessories) and wright:
select disk 0
select partition 1
now when you restart you will see chameleon.
i hope that i helped you.