Changing Ubuntu 10.4 Boot Loader Option

Hi,
I am using Ubuntu 10.4 and I want to change the boot loader option to boot Windows 7 by default. Every time I update Ubuntu some extra lines appears at the boot menu. I want to remove them also. Please help me

You would do well to read about your bootloader here:
Ubuntu Grub2 Doc

You'll have to edit /etc/default/grub as root to change the options. The doc
will help explain what the sections mean. I also changed the displayed labels on
my boot menu so my non-techy spouse would know what was what.

You run the update-grub command and /boot/grub/grub.cfg is updated with your
changes.