I think what you would like is for windows to boot as default and not ubuntu
If this is correct it can be done,
Boot into ubuntu
sudo vim /etc/default/grub
gksudo gedit /etc/default/grub
The part that needs editing is
# If you change this file, run 'update-grub' afterwards to update
# For full documentation of the options in this file, see:
# info -f grub -n 'Simple configuration'
GRUB_DEFAULT=0<< "the 0 needs to be changed to the number that corresponds to windows"
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
I cant tell you which one that is, As grub loads just count which number is windows then change the 0 to the number
When you have edited the file run