headache ,install ubuntu under xp help

Hi
i spend some hours to install ubuntu in the same hard disk with xp

well my layout is

c: -> xp
d: -> data
e: -> music
f: ->unlocated space 100gb for ubuntu

i would like to install ubuntu in the f: partition , without touching the mbr of xp

may i install ubuntu in F: run xp , and use the xp boot.ini to boot with ubuntu

well i found some tutorials , but outdated and really i get a bad headache
http://apcmag.com/how_to_dual_boot_windows_xp_and_linux_xp_installed_first.htm?page=4 for example

could you help and say how do it ? if i can?
i would appreciate it a lot!

thanks
cheers

 

i mean install ubuntu without grub , can i do it?

 

I hope yes
Here you have tip:
http://bkpavan.wordpress.com/2008/04/02/how-to-boot-linux-using-windows-bootloader-xp/