Normally you have to install ubuntu after installing windows. But any how if you do it in the other way deffinitely you won't get a selection list for OSs. So you can try this out.
Boot from the Ubuntu live Cd and then open the terminal. Then type those in the terminal:
sudo grub
This will enter you to the grub prompt. Next enter the rest of the codes in the grub prompt.
find /boot/grub/stage1
then u will showout some details. so in the next command you have to enter some details from those. Fill up the next command with appropriate daetail that came from the above command.
root (hd*,*)
chenge the asterix with data that recived from the previous command. Then enter the next command to install grub in to master boot record.
setup (hd0)
that is the end of restoring the grub. then to quit from the grub shell enter
quit
then resart the computer. Then u'll get the grub as it was. Enjoy :)
